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Journal articles on the topic 'Shell deposits'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 March 2023

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1

Sakuna-Schwartz, D., P. Feldens, K. Schwarzer, S. Khokiattiwong, and K. Stattegger. "Internal structure of event layers preserved on the Andaman Sea continental shelf, Thailand: tsunami vs. storm and flash-flood deposits." Natural Hazards and Earth System Sciences 15, no. 6 (2015): 1181–99. http://dx.doi.org/10.5194/nhess-15-1181-2015.

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Abstract. Tsunami, storm and flash-flood event layers, which have been deposited over the last century on the shelf offshore Khao Lak (Thailand, Andaman Sea), are identified in sediment cores based on sedimentary structures, grain size compositions, Ti / Ca ratios and 210Pb activity. Individual offshore tsunami deposits are 12 to 30 cm in thickness and originate from the 2004 Indian Ocean Tsunami. They are characterized by (1) the appearance of sand layers enriched in shells and shell debris and (2) the appearance of mud and sand clasts. Storm deposits found in core depths between 5 and 82 cm

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2

Sakuna-Schwartz, D., P. Feldens, K. Schwarzer, S. Khokiattiwong, and K. Stattegger. "Internal structure of event layers preserved on the Andaman Sea continental shelf, Thailand: tsunami vs. storm and flash flood deposits." Natural Hazards and Earth System Sciences Discussions 2, no. 12 (2014): 7225–67. http://dx.doi.org/10.5194/nhessd-2-7225-2014.

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Abstract. Tsunami, storm and flash event layers, which have been deposited over the last century on the shelf offshore from Khao Lak (Thailand, Andaman Sea), are identified in sediment cores based on sedimentary structures, grain size compositions, Ti / Ca ratios and 210Pb activity. Individual offshore tsunami deposits are 12 to 30 cm in thickness and originate from the 2004 Indian Ocean tsunami. They are characterized by (1) the appearance of sand layers enriched in shells and shell debris, (2) cross lamination and (3) the appearance of rip-up clasts. Storm deposits found in core depths betwe

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3

Carey, Stephen P., John E. Sherwood, Megan Kay, Ian J. McNiven, and James M. Bowler. "The Moyjil site, south-west Victoria, Australia: stratigraphic and geomorphic context." Proceedings of the Royal Society of Victoria 130, no. 2 (2018): 14. http://dx.doi.org/10.1071/rs18004.

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Shelly deposits at Moyjil (Point Ritchie, Warrnambool), Victoria, together with ages determined from a variety of techniques, have long excited interest in the possibility of a preserved early human influence in far south-eastern Australia. This paper presents a detailed analysis of the stratigraphy of the host Bridgewater Formation (Pleistocene) at Moyjil and provides the context to the shelly deposits, evidence of fire and geochronological sampling. We have identified five superposed calcarenite–palaeosol units in the Bridgewater Formation, together with two prominent erosional surfaces that

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4

Davies, David J., and Molly F. Miller. "Paleocommunity information retrieval vs. shell accumulation mode in Paleozoic carbonates: examples from the Lebanon Limestone (Middle Ordovician), Tennessee, U.S.A." Paleontological Society Special Publications 6 (1992): 81. http://dx.doi.org/10.1017/s2475262200006419.

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Compared to their terrigenous counterparts, carbonate shell accumulations have until recently been relatively little studied to determine either descriptive or genetic classifications of shell bed types, the preservation potential of each type, or their relative ability to preserve community-level information. A partial classification of Paleozoic carbonate shell-rich soft sediment accumulations is proposed using sedimentation patterns in the Lebanon limestone of the Stones River Group. Paleoecological information preserved therein is then contrasted by shell bed type. The Lebanon represents t

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5

Corcoran, P. L., and L. N. Moore. "Subaqueous eruption and shallow-water reworking of a small-volume Surtseyan edifice at Kakanui, New Zealand." Canadian Journal of Earth Sciences 45, no. 12 (2008): 1469–85. http://dx.doi.org/10.1139/e08-068.

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Kakanui volcaniclastic deposits on the South Island of New Zealand are the remnants of two late Eocene to early Oligocene Surtseyan-type cones. Eruptive-dominated material of the (i) stratified tuff and lapilli tuff, and (ii) lapilli tuff breccia lithofacies and post-eruptive debris of the (iii) shell-rich tuff and lapilli tuff, and (iv) chaotic and cross-bedded tuff and lapilli tuff lithofacies compose the deposits. The 9–250 m thick stratified tuff and lapilli tuff contains grain-flow deposits originating from low-volume tephra jets and local thinning and fining upward sequences that formed

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Meldahl, Keith H. "Origin of Shell Beds and Evolution of a Shelly Sand Spit, Bahia la Choya, Northern Gulf of California." Paleontological Society Special Publications 2 (1987): 189–99. http://dx.doi.org/10.1017/s2475262200004810.

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An actively prograding shelly sand spit forms the eastern margin of Bahia la Choya, northern Gulf of California. Shell-rich deposits exposed on the eastern side of the spit record previous phases of spit growth. Analysis and comparison of faunal composition, biofabric and shell preservation from the beach, estero mouth bar, and the fossil spit deposits suggest 3 major phases of spit evolution: (1) southward progradation of the spit tip/estero mouth bar (lower shell bed), (2) deposition of washover lobes during a major storm (upper shell bed), and (3) eolian accretion (spit crest). A 1300 ± 50

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7

Vermeij, Geerat J. "The oyster enigma variations: a hypothesis of microbial calcification." Paleobiology 40, no. 1 (2014): 1–13. http://dx.doi.org/10.1666/13002.

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Oysters, whose inner shell layer contains chambers, vesicles, and sometimes chalky deposits, often have extraordinarily thick shells of large size, prompting the idea that there is something unusual about the process of shell fPormation in these and similarly structured bivalves with the oyster syndrome. I propose the hypothesis that calcifying microbes, especially sulfate-reducing bacteria growing on organic substrates in fluid-filled shell-wall chambers, are responsible for shell calcification away from the shell-secreting mantle of the host bivalve. Other phenomena, including the formation

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8

Dattilo, Benjamin F., Carlton E. Brett, Cameron J. Tsujita, and Robert Fairhurst. "Sediment supply versus storm winnowing in the development of muddy and shelly interbeds from the Upper Ordovician of the Cincinnati region, USAThis article is one of a series of papers published in this Special Issue on the theme The dynamic reef and shelly communities of the Paleozoic. This Special is in honour of our colleague and friend Paul Copper." Canadian Journal of Earth Sciences 45, no. 2 (2008): 243–65. http://dx.doi.org/10.1139/e07-060.

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Shell-bed development can be a product of complex sedimentological and biological factors. The Upper Ordovician sediments near Cincinnati, Ohio constitute a succession of thinly interbedded shelly carbonates and mudrocks. Despite years of study, the development of Cincinnatian shell beds and metre-scale cycles has, until recently, been attributed solely to storm reworking. This “storm-winnowing model” treats shells as passive sedimentary clasts, ignoring other factors of shell-bed development. A recently proposed alternative is Brett and Algeo’s idea that these shell beds grew during long peri

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9

Sparks, Darrell, and I. E. Yates. "Anatomy of Shuck Abscission in `Desirable' Pecan." Journal of the American Society for Horticultural Science 120, no. 5 (1995): 790–97. http://dx.doi.org/10.21273/jashs.120.5.790.

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Cellular changes associated with shuck dehiscence and markings deposited on pecan [Carya illinoinensis (Wangenh.) C. Koch] shells were examined by scanning electron and light microscopy. Fruit were sampled at three stages of maturity: 1) shuck and shell fused, 2) sutures separated (shuck opening), and 3) vascular system separated from shuck. Shuck dehiscence involved temporally regulated abscission events with shuck-shell, then shuck-suture, and finally shuck-vascular system separation. Abscission events occurred in a tissue zone common to and continuous among all three separation sites, even

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10

Roy, Peter S. "Shell Hash Dating and Mixing Models for Palimpsest Marine Sediments." Radiocarbon 33, no. 3 (1991): 283–89. http://dx.doi.org/10.1017/s0033822200040303.

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The dating of palimpsest marine sediments using broken shell fragments (shell hash) is considered to be a necessary but unreliable technique because of the mixed age of the fragments. An analysis of geological mixing models and radiocarbon data on shell hash from sandy sediments on the southeast Australian coast and shelf are used to examine the possibility for simulating the depositional processes, and thus, to better understand the age structure of the deposits.

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11

Sherwood, John E., Ian J. McNiven, and Laurie Laurenson. "The Moyjil site, south-west Victoria, Australia: shells as evidence of the deposit’s origin." Proceedings of the Royal Society of Victoria 130, no. 2 (2018): 50. http://dx.doi.org/10.1071/rs18006.

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Characteristics of marine shellfish and other species found in a Last Interglacial (LIG) shell deposit at Point Ritchie (Moyjil) at Warrnambool in south-western Victoria have been compared to those from modern and LIG natural beach deposits, Holocene Aboriginal middens and modern Pacific Gull (Larus pacificus) middens. The research was aimed at determining whether properties such as shell speciation, size or taphonomy could identify the mechanism responsible for formation of the Moyjil deposit. Marine species found in the Moyjil deposit resemble those found in both Aboriginal and Pacific Gull

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12

FÜRSICH, FRANZ T., and YANHONG PAN. "Diagenesis of bivalves from Jurassic and Lower Cretaceous lacustrine deposits of northeastern China." Geological Magazine 153, no. 1 (2015): 17–37. http://dx.doi.org/10.1017/s0016756815000242.

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AbstractIn contrast to the numerous excellently preserved arthropods, vertebrates and plants from the Mesozoic lacustrine fossil lagerstätten of northeastern China, which have calcium phosphate or organic skeletons, the preservation of taxa with a calcareous skeleton is fairly poor. Here we investigate, using a scanning electron microscope and energy dispersive X-ray spectrometer, the preservational modes of bivalves from the Jurassic Daohugou Fossil Beds of Inner Mongolia and the Lower Cretaceous Yixian Formation of eastern Liaoning. The Jurassic bivalve Ferganoconcha sibirica is preserved as

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13

Groenenberg, Dick S. J., Frank P. Wesselingh, Sanjeevi Rajagopal, et al. "On the identity of broad-shelled mussels (Mollusca, Bivalvia, Mytilus) from the Dutch delta region." Contributions to Zoology 80, no. 2 (2011): 95–106. http://dx.doi.org/10.1163/18759866-08002001.

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Late Quaternary (Eemian) deposits of the Netherlands contain shells that resemble those of living Mytilus galloprovincialis. Similar broad-shelled mytilids also occur in estuaries of the southwestern Netherlands together with slender individuals typical of M. edulis. We sampled living mussels along a depth gradient in the Oosterschelde to a) investigate whether a relation exists between shell shape and depth, b) test if the broadshelled specimens might represent M. galloprovincialis (or a hybrid with M. edulis) and c) assess by inference if the Quaternary specimens might be attributed to M. ga

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Šimo, Vladimír, and Adam Tomašových. "Trace-fossil assemblages with a new ichnogenus in “spotted”." Geologica Carpathica 64, no. 5 (2013): 355–74. http://dx.doi.org/10.2478/geoca-2013-0024.

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Abstract Highly-bioturbated “spotted” limestones and marls (Fleckenmergel-Fleckenkalk facies) of the Early Jurassic, which were deposited in broad and recurrent deep-shelf habitats of the Northern Tethys, are characterized by rare benthic carbonate-producing macroinvertebrates. To address this paradox, we analyse trace-fossil assemblages in a ~85 m-thick succession of Pliensbachian spotted deposits (Zliechov Basin, Western Carpathians). They are dominated by infaunal and semi-infaunal deposit-feeders, with 9 ichnogenera and pyritized tubes of the semi-infaunal foraminifer Bathysiphon, being do

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15

Kaufman, Darrell, L. David Carter, Gifford H. Miller, G. Lang Farmer, and David A. Budd. "Strontium isotopic composition of Pliocene and Pleistocene molluscs from emerged marine deposits, North American Arctic." Canadian Journal of Earth Sciences 30, no. 3 (1993): 519–34. http://dx.doi.org/10.1139/e93-041.

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High-precision strontium (Sr) isotopic measurements were obtained for 53 Pliocene and Pleistocene molluscan shells from emerged marine deposits around the coasts of Arctic North America to test whether such data can be used for chronostratigraphic purposes. 87Sr/86Sr ratios from Sr isotopic measurements on many marine fossils from Arctic Ocean borderland sites are broadly consistent with their expected values based on independent age control and on a comparison with the Sr isotopic evolution of seawater recorded in deep-sea cores. All 87Sr/86Sr ratios measured for shells from Middle and Late P

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16

Bērziņš, Valdis, Ute Brinker, Christina Klein, et al. "New research at Riņņukalns, a Neolithic freshwater shell midden in northern Latvia." Antiquity 88, no. 341 (2014): 715–32. http://dx.doi.org/10.1017/s0003598x0005064x.

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The prehistoric shell middens of Atlantic Europe consist of marine molluscs, but the eastern Baltic did not have exploitable marine species. Here the sole recorded shell midden, at Riņņukalns in Latvia, is on an inland lake and is formed of massive dumps of freshwater shells. Recent excavations indicate that they are the product of a small number of seasonal events during the later fourth millennium BC. The thickness of the shell deposits suggests that this was a special multi-purpose residential site visited for seasonal aggregations by pottery-using hunter-gatherer communities on the norther

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17

Bailey, Geoff, and Elizabeth Rich. "Weipa Shell Mounds: Cultural or Natural Deposits?" Australian Archaeology 43, no. 1 (1996): 53. http://dx.doi.org/10.1080/03122417.1996.12094422.

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18

Donato, S. V., E. G. Reinhardt, J. I. Boyce, R. Rothaus, and T. Vosmer. "Identifying tsunami deposits using bivalve shell taphonomy." Geology 36, no. 3 (2008): 199. http://dx.doi.org/10.1130/g24554a.1.

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19

FAULKNER, PATRICK. "Quantifying shell weight loss in archaeological deposits." Archaeology in Oceania 46, no. 3 (2011): 118–29. http://dx.doi.org/10.1002/j.1834-4453.2011.tb00106.x.

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20

Katupotha, Jinadasa, and N. P. Wijayananda. "Chronology of Inland Shell Deposits on the Southern Coast of Sri Lanka." Quaternary Research 32, no. 2 (1989): 222–28. http://dx.doi.org/10.1016/0033-5894(89)90078-1.

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AbstractExtensive patches of fossil shell deposits are found in many places along the rims of emerged coastal embayments and lagoon floors on the southern coast of Sri Lanka. Compositional and depositional sequences of fossil shells (Veneridae, Cerithidae, and Nassaridae) reveal that the bulk of the valves has been accumulated by three processes: (a) the shells have been piled up on the rims of emerged coastal embayments mainly by wave action; (b) following coastal progradation since the late Subboreal the shells possibly gathered on lagoon floors; and (c) the valves on the coastal hilly areas

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Miller, Molly F., and David J. Davies. "Did shell layers negatively affect Ordovician soft-bodied infauna?" Paleontological Society Special Publications 6 (1992): 213. http://dx.doi.org/10.1017/s2475262200007735.

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What is the relationship, if any, between soft-bodied infaunal animals and shell accumulations? Do shell layers negatively affect infaunal animals and have they in the past? To determine whether this type of taphonomic inhibition may have operated in Ordovician infaunal communities, we evaluated extent of burrow penetration of shell-rich layers in shallow-water limestones of the Lebanon Formation, central Tennessee. Most of the analyzed shell layers, which are a few mm to 15 cm thick, are not cut by burrows. No burrows occur in shell layers in slabs containing 67% of the total area examined (5

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22

Butts, Susan H. "Silicification." Paleontological Society Papers 20 (October 2014): 15–34. http://dx.doi.org/10.1017/s1089332600002783.

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Silicification is the replacement of original skeletal material accomplished through the concurrent dissolution of calcium carbonate and precipitation of silica. The processes is aided by the nucleation of silica to organic matter which surrounds the mineral crystallites within the shell. Factors that control silicification are those that influence the dissolution/precipitation process: shell mineralogy, shell ultrastructure (and, therefore, surface area), the amount and location of organic matter, and the character of the enclosing matrix. Silicification, like all types of fossilization, can

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Burke, Chrissina C., Katie K. Tappan, Gavin B. Wisner, Julie A. Hoggarth, and Jaime J. Awe. "TO EAT, DISCARD, OR VENERATE: FAUNAL REMAINS AS PROXY FOR HUMAN BEHAVIORS IN LOWLAND MAYA PERI-ABANDONMENT DEPOSITS." Ancient Mesoamerica 31, no. 1 (2020): 127–37. http://dx.doi.org/10.1017/s0956536119000221.

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AbstractInterpreting middens, feasting events, ritual, or terminal deposits in the Maya world requires an evaluation of faunal remains. Maya archaeologists consistently evaluate other artifact classes, but often offer simply number of identified specimens values for skeletal elements recovered from these deposits. To further understand their archaeological significance, we analyzed faunal materials from deposits at the sites of Baking Pot and Xunantunich in the Upper Belize River Valley. We identified the species, bone elements, bone or shell artifacts, taphonomic signatures, and quantitative

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Sorokin, V. M., T. A. Yanina, and B. F. Romanyuk. "New finds of Karangat deposits in the eastern part of the Black Sea." Moscow University Bulletin. Series 4. Geology, no. 5 (December 17, 2022): 113–19. http://dx.doi.org/10.33623/0579-9406-2022-5-113-119.

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The sections of boreholes and sediment cores in the Taman shelf area and on the Caucasian continental slope, which uncovered shallow and deep-water facies of the interglacial Karangate horizon, were studied. The shallow-water sediments include clayey and sandy-shell varieties containing stenohaline marine molluscan fauna. Deep-water sediments are represented by sapropelic and coccolithic layers with a marine flora of diatom algae and coccolithophorids.

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Ma, Xueping, and Jed Day. "Revision of selected North American and Eurasian Late Devonian (Frasnian) species of Cyrtospirifer and Regelia (Brachiopoda)." Journal of Paleontology 77, no. 2 (2003): 267–92. http://dx.doi.org/10.1017/s0022336000043638.

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Study of the shell features of Givetian and Frasnian spiriferid brachiopods attributed to the genus Cyrtospirifer shows that the type species C. verneuili has micro-ornament consisting of fine concentric growth lines, radial capillae, with microspines arising from some capillae, spine bases appear to extend into the primary shell layer. Its dorsal interior features a pseudoseptum supporting the cardinalia. Micro-ornament of Cyrtospirifer varies widely and is a useful criterion for characterization of species of the genus. Most Frasnian species retained in the genus have micropustulate shells.

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CZAJA, ALEXANDER, ALAN P. COVICH, THOMAS A. NEUBAUER, JOSÉ LUIS ESTRADA-RODRÍGUEZ, VERÓNICA ÁVILA-RODRÍGUEZ, and JORGE SÁENZ MATA. "A new freshwater snail genus and species (Gastropoda: Caenogastropoda, Cochliopidae) with extremely spinous shells from sub-recent spring deposits in northeastern Mexico." Zootaxa 5169, no. 5 (2022): 472–80. http://dx.doi.org/10.11646/zootaxa.5169.5.5.

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A new monotypic genus of freshwater snail from late Holocene spring deposits in Viesca, Coahuila (Mexico), is described based on shell morphology. Spinopyrgus luismaedai n. gen. et n. sp. has two to three carinate shells with long and wide shovel-shaped spines, strong axial ridges and a pointed protoconch. All sculptural ornamentations on the teleoconch are part of the calcareous shell material and not projections of the periostracum. This combination of shell features and their almost “marine-like” appearance is unknown among North American recent and fossil freshwater snails. Because of its

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LAZER, KAYLA, IAN P. STOUT, EDWARD L. SIMPSON, MICHAEL C. WIZEVICH, ABIGAL M. KEEBLER, and GRACE K. HETRICK. "PRESERVED MEMBRANE ON DINOSAUR EGGSHELL FRAGMENTS, UPPER JURASSIC MORRISON FORMATION, EASTERN UTAH." PALAIOS 38, no. 1 (2023): 43–55. http://dx.doi.org/10.2110/palo.2022.002.

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ABSTRACT Dinosaur eggshell fragments, from the Upper Jurassic Brushy Basin Member of the Morrison Formation, Utah, were examined using Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive Spectroscopy, and Raman Spectroscopy. Analyses revealed that the mammillary tips on the shell interior contain carbonaceous residue. Comparison under the FESEM of these shells with modern bird shells, including some samples heated to diagenetic temperatures, indicate that the residue is degraded organic compounds (DOC). Bird egg membrane is composed of interlaced collagen fibers. Features ob

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Kristina Hirst, K., Robert G. Thompson, and Katherine S. Walters. "Tracing the use of freshwater naiad shells as prehistoric implements through scanning electron microscopy and x-ray microanalysis." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 3 (1990): 717. http://dx.doi.org/10.1017/s042482010016114x.

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Many freshwater naiad shells recovered from prehistoric Iowa archaeological sites have edges exhibiting patterns of use-wear. The ethnographic and ethnohistoric records contain accounts of the use of these shells in the removal of kernels from corn cobs. Recently, archaeologists have begun tracing use of stone implements through analysis of microscopic wear patterns and deposition of material such as opal phytoliths. Opal phytoliths are small silica bodies which plants deposit within and between some cells. Corn is among the plants which produce opal phytoliths in abundance. Experimentally cre

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Banjac, Nenad, Klaus Bandel, and Steffen Kiel. "Cassiopid gastropods from the cretaceous of Western Serbia." Annales g?ologiques de la Peninsule balkanique, no. 68 (2007): 61–71. http://dx.doi.org/10.2298/gabp0701061b.

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Three species of Cassiopidae (Cerithioidea, Gastropoda) are described from outcrops in the vicinity of the villages Rastiste and Mokra Gora in western Serbia. They occur in marly limestones of near shore shallow water deposits. Earlier micropaleontological investigations have indicated an Albian-Cenomanian age. The species encountered are related to those present in deposits of the European margin of the Tethys and closest relationships exist to those of the Armenian and Transcaucasian region. Our species can be placed in the genera Cassiope, Paraglauconia and Bicarinella. A new species Cassio

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Thompson, Victor D., and C. Fred T. Andrus. "Evaluating Mobility, Monumentality, and Feasting at the Sapelo Island Shell Ring Complex." American Antiquity 76, no. 2 (2011): 315–43. http://dx.doi.org/10.7183/0002-7316.76.2.315.

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Two of the most salient anthropological questions regarding southeastern shell ring sites are related to the season(s) that they were occupied and whether or not the deposits represent monumental constructions and/or feasting remains. This paper addresses these questions through the analysis of growth band of clams (Mercenaria spp.) (N = 620) and stable oxygen isotope ratios of clam and oyster shells (Crassostrea virginica) (N = 58) at the Sapelo Island Shell Ring complex located on the Georgia coast, USA. The season of death and the samples' position in the shell matrix at Sapelo provide impo

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Carter, Melissa, Ian Lilley, Sean Ulm, and Deborah Brian. "Mort Creek Site Complex, Curtis Coast: Site Report." Queensland Archaeological Research 11 (December 1, 1999): 85. http://dx.doi.org/10.25120/qar.11.1999.88.

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This paper reports the results of excavations conducted at the Mort Creek Site Complex, located in the Rodds Peninsula Section of Eurimbula National Park on the southern Curtis Coast, Central Queensland. Cultural and natural marine shell deposits were excavated and analysed as part of an investigation of natural and cultural site formation processes in the area. Analyses (including foraminifera studies) demonstrate a complex site formation history, with interfingering of cultural and natural shell deposits (cheniers) in some areas of the site. Radiocarbon dating indicates that Aboriginal occup

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Al-Jaberi, Mohanad Hamid, Harith A. Al-Saad, Ghazi A. Hussain, and Hiba Khalid Lafta. "Study of Unio shells in the Quaternary deposits, southern Iraq." IOP Conference Series: Earth and Environmental Science 1087, no. 1 (2022): 012020. http://dx.doi.org/10.1088/1755-1315/1087/1/012020.

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Abstract Shells are useful in evolutionary biology and paleobiology. Freshwater shells compose the main types of mollusks, and can use as a key for ecological variations. Shell samples in the present study were collected on the highway of Nasyriah city-Samawa city, southern Iraq. The study area contains a large accumulation of shells at 6-7m depths, especially at 7m depth. The main types of these shells are Unio, Corbicula, and Melanoides tuberculata. Unio was the most species common in the study area. Unio species were used to detect the paleoenvironment in Quaternary deposits, in southern Ir

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Kim, Young Jun, Hyein Lee, Hee-Suk Chung, Youngku Sohn, and Choong Kyun Rhee. "PT-BI Co-Deposit Shell on AU Nanoparticle Core: High Performance and Long Durability for Formic Acid Oxidation." Catalysts 11, no. 9 (2021): 1049. http://dx.doi.org/10.3390/catal11091049.

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This work presents the catalysts of Pt-Bi shells on Au nanoparticle cores and Pt overlayers on the Pt-Bi shells toward formic acid oxidation (FAO). Pt and Bi were co-deposited on Au nanoparticles (Au NP) via the irreversible adsorption method using a mixed precursor solution of Pt and Bi ions, and the amount of the co-deposits was controlled with the repetition of the deposition cycle. Rinsing of the co-adsorbed ionic layers of Pt and Bi with a H2SO4 solution selectively removed the Bi ions to leave Pt-rich and Bi-lean (<0.4 atomic %) co-deposits on Au NP (Pt-Bi/Au NP), conceptually similar

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Hutchinson, Ian. "Spatiotemporal Variation in ΔR on the West Coast of North America in the Late Holocene: Implications for Dating the Shells of Marine Mollusks". American Antiquity 85, № 4 (2020): 676–93. http://dx.doi.org/10.1017/aaq.2020.47.

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Radiocarbon ages on mollusk shells, which account for about half of the more than 8,000 dates from cultural deposits on the west coast of North America, need to be corrected for the local marine reservoir effect (ΔR) to yield true ages. Assays on “prebomb” shells show that ΔR increases poleward, echoing the age gradient in offshore waters. The meridional gradient in ΔR is not appreciably affected by the transition either from an upwelling regime to a downwelling regime north of 40°N–45°N or from a winter maximum-high alkalinity river discharge pattern to a summer maximum-low alkalinity pattern

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Wang, Wei-Wei, Yu Gu, Hao Yan, et al. "Formation sequence of solid electrolyte interphases and impacts on lithium deposition and dissolution on copper: an in situ atomic force microscopic study." Faraday Discussions 233 (2022): 190–205. http://dx.doi.org/10.1039/d1fd00043h.

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In situ AFM monitoring of the morphology evolution of Li deposits reveals that SEIs could be more influential on Li dissolution, and spatial integration of the SEI shell on Li deposits is important to maintain reversible deposition and dissolution cycles.

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Sharma, Komal, Nilesh Bhatt, Anil Dutt Shukla, Dae-Kyo Cheong, and Ashok Kumar Singhvi. "Optical dating of late Quaternary carbonate sequences of Saurashtra, western India." Quaternary Research 87, no. 1 (2017): 133–50. http://dx.doi.org/10.1017/qua.2016.12.

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AbstractBioclastic carbonate deposits that formed because of a combination of nearshore marine, fluvial, and aeolian processes, occur along the Saurashtra coast and in the adjacent interior regions of western India. Whether these carbonates formed by marine or aeolian processes has been debated for many decades. The presence of these deposits inland poses questions as to whether they are climate controlled or attributable to postdepositional tectonic uplift. In particular, the debate centres on chronologic issues including (1) appropriate sampling strategies and (2) the use of 230Th/234U and 1

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Flessa, Karl W., Alan H. Cutler, and Keith H. Meldahl. "Time and taphonomy: quantitative estimates of time-averaging and stratigraphic disorder in a shallow marine habitat." Paleobiology 19, no. 2 (1993): 266–86. http://dx.doi.org/10.1017/s0094837300015918.

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We examined the radiocarbon age, taphonomic condition and stratigraphic position of shells of the venerid bivalveChionespp. from the tidal flats of Bahia la Choya, Sonora, Mexico. Shells in Bahia la Choya are time-averaged. Thirty shells yielded radiocarbon dates from modern (A.D. 1950 or younger) to 3569 years before present. The median calendar age of inner flat shells is 483 years; the median age of tidal channel shells is 427 years. We interpret such long shell survival to be the result of frequent shallow burial. Such burial retards bioerosion of shells.The taphonomic condition of shells

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Hausmann, Niklas, and Matthew Meredith-Williams. "Exploring Accumulation Rates of Shell Deposits Through Seasonality Data." Journal of Archaeological Method and Theory 24, no. 3 (2016): 776–95. http://dx.doi.org/10.1007/s10816-016-9287-x.

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LEBEDEVA, I. V., M. I. FARFEL, D. Yu KONYASHIN, and M. M. BEREZIN. "EXPERIMENTAL STUDY OF SNOW LOAD DISTRIBUTION ON A SHELL OF THE GRAND SPORTS ARENA OF LUZHNIKI OLYMPIC COMPLEX." Bulletin of Science and Research Center of Construction 35, no. 4 (2023): 40–61. http://dx.doi.org/10.37538/2224-9494-2022-4(35)-40-61.

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Introduction. The mechanism of the formation of snow deposits on the shell of the Luzhniki GSA and their redistribution in winter were established on the basis of the data obtained during the monitoring of the snow load for over 20 years.Aim. In this article, the mechanism of the formation of snow deposits and their distribution on the shell of the Luzhniki GSA were determined, along with the numerical values of the form factor μ characterizing the transition from the ground snow load to the snow load on the shell.Materials and methods. The measurements of the load and density of snow deposits

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Sherwood, John E., Jim M. Bowler, Stephen P. Carey, et al. "The Moyjil site, south-west Victoria, Australia: chronology." Proceedings of the Royal Society of Victoria 130, no. 2 (2018): 32. http://dx.doi.org/10.1071/rs18005.

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An unusual shell deposit at Moyjil (Point Ritchie), Warrnambool, in western Victoria, has previously been dated at 67±10 ka and has features suggesting a human origin. If human, the site would be one of Australia’s oldest, justifying a redetermination of age using amino acid racemisation (AAR) dating of Lunella undulata (syn. Turbo undulatus) opercula (the dominant shellfish present) and optically stimulated luminescence (OSL) of the host calcarenite. AAR dating of the shell bed and four Last Interglacial (LIG) beach deposits at Moyjil and Goose Lagoon, 30 km to the west, confirmed a LIG age.

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Duffield, Seonaid, Jennifer Walkus, Elroy White, Iain McKechnie, Quentin Mackie, and Duncan McLaren. "Documenting 6,000 Years of Indigenous Fisheries and Settlement as Seen through Vibracore Sampling on the Central Coast of British Columbia, Canada." American Antiquity 87, no. 1 (2021): 168–83. http://dx.doi.org/10.1017/aaq.2021.113.

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This article highlights the utility of vibracore technology to sample deep shell midden deposits on the Central Pacific Coast of British Columbia, Canada. Analysis of six core samples and 21 radiocarbon dates revealed that the archaeological deposits extended to a depth of 544 cm below surface and that occupation began approximately 6,000 years ago, continuing into the sixteenth century AD. Zooarchaeological identification of fine screened (2 mm) sediments shows that fish constitute 99.8% of identified vertebrate fauna, with a focus on herring (Clupea pallasii), salmon (Oncorhynchus sp.), rock

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Parker, Wesley G., Yurena Yanes, Eduardo Mesa Hernández, Juan Carlos Hernández Marrero, Jorge Pais, and Donna Surge. "Scale of time-averaging in archaeological shell middens from the Canary Islands." Holocene 30, no. 2 (2019): 258–71. http://dx.doi.org/10.1177/0959683619883020.

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Characterizing the degree of disturbance in archaeological deposits is critically important for archaeologists assessing foraging strategies, environmental conditions, or behavior patterns of ancient human groups. Qualitative techniques (e.g. micromorphology analysis) have previously been applied to assess the degree of disturbance (age-mixing) in archaeological sites; however, quantitative dating of material in the sites provides a more robust assessment of potential age-mixing. Unfortunately, because of budget constraints, archaeologists are frequently forced to rely on few quantitative age

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Shepherd, SA, M. Avalos-Borja, and MO Quintanilla. "Toward a chronology of Haliotis fulgens, with a review of abalone shell microstructure." Marine and Freshwater Research 46, no. 3 (1995): 607. http://dx.doi.org/10.1071/mf9950607.

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The microstructure of the shell of the abalone Haliotis fulgens consists of alternate layers of aragonite and prismatic calcium with darker organic matrix (conchiolin) that are visible as rings when the shell is ground down at the spire. This abalone deposits about four prismatic layers in the first year and three layers each year thereafter at the site studied. Prismatic layers are laid down in about April, August and November, corresponding with sea temperature minima and maxima and with the spawning season. After about 3 years of age, prismatic layers at the spire of the shell begin to be l

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Kluiving, S. J., L. R. Bartek, and F. M. van der Wateren. "Multi-scale analyses of subglacial and glaciomarine deposits from the Ross Sea continental shelf, Antarctica." Annals of Glaciology 28 (1999): 90–96. http://dx.doi.org/10.3189/172756499781822039.

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AbstractPiston cores collected from the Ross Sea continental shelf, Antarctica, were studied as part of a multi-scale analysis of glacial and glaciomarine stratigraphy and sedimentology. The objective of these analyses was to differentiate glaciomarine sediments from subglacially deformed tills. Results from analyses of microstructures, lithofacies and seafloor morphology indicate that glaciomarine and subglacially deformed sediments can be clearly distinguished and further characterized by variations in textural parameters. Overcompaction, as well as presence of stratification in sediments, a

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Ajayan, P. M., Ph Redlich, and M. Rühle. "Balance of graphite deposition and multishell carbon nanotube growth in the carbon arc discharge." Journal of Materials Research 12, no. 1 (1997): 244–52. http://dx.doi.org/10.1557/jmr.1997.0032.

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Except for atomistic models of individual carbon nanotube growth, there is still no precise understanding of the large scale deposition of carbon during the arc discharge. We study the microstructure of cathode deposits in detail using scanning electron microscopy, focusing on two distinct regimes found in the deposits having different large scale morphology. The shell grown circumferentially consists of extended graphite layers with preferred orientation, and the structure reveals close similarity to pyrolitic graphite. The core region is a porous assembly of nanotubes and nanoparticles. We c

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Lozouet, Pierre. "First record of the Caribbean genus Cittarium (Mollusca: Gastropoda: Trochidae) from the Oligocene of Europe and its paleobiogeographic implications." Journal of Paleontology 76, no. 4 (2002): 767–70. http://dx.doi.org/10.1017/s0022336000042037.

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The West Indian Top-shell, Cittarium pica (Linnaeus, 1758), is a very classic and common species of the Caribbean faunal province. Until now the only known fossil occurrence of Cittarium pica, and of the genus Cittarium, is from Pleistocene deposits restricted to the Caribbean province (Clench and Abbott, 1943). Despite the turbiniform shell, the monotypic genus Cittarium belongs to the family Trochidae and was assigned to the tribe Gibbilini Stoliczka, 1868 by Hickman and McLean (1990). This paper reports a new species of Cittarium and the only record outside the Caribbean province. More than

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Martias, Irsyad. "MODEL TRANSFORMASI SAMPAH CANGKANG KERANG DI PERMUKIMAN KAWASAN PESISIR WATUKARUNG, PACITAN: STUDI ETNOARKEOLOGI." Berkala Arkeologi 32, no. 1 (2012): 65–82. http://dx.doi.org/10.30883/jba.v32i1.48.

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Ecofact is a key for investigating mode of adaptation. Ecofact that commonly found on archaeological sites especially on inhabited caves were shell deposits. Fundamentally, the formation of archaeological record was resulted from behavioral processes and transformational processes. However, the problem is that we can’t observe them, because those aspects had occurred in past time. Etnoarchaeological study can be used to solve those problems. Ethnoarchaeology studies have given contribution to interpret various aspects of human life of the past, starting from issues related to the technological

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Cannon, Aubrey. "Settlement and Sea-Levels on the Central Coast of British Columbia: Evidence from Shell Midden Cores." American Antiquity 65, no. 1 (2000): 67–77. http://dx.doi.org/10.2307/2694808.

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AbstractCoring of shell-midden sites provides a regional chronology of site settlement in the Namu vicinity on the central coast of British Columbia. Coring proved an accurate and cost-effective alternative to traditional test-excavation, and its application in only two short field seasons doubled the number of sites tested in this region. The dating of basal cultural deposits from the cores shows initial occupation of sites ranging from 10,000 to 800 B.P. These dates exhibit a strong linear relationship with the current elevation of deposits above average high tide, suggesting that the settle

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Davis, Dylan S., Robert J. DiNapoli, Matthew C. Sanger, and Carl P. Lipo. "The Integration of Lidar and Legacy Datasets Provides Improved Explanations for the Spatial Patterning of Shell Rings in the American Southeast." Advances in Archaeological Practice 8, no. 4 (2020): 361–75. http://dx.doi.org/10.1017/aap.2020.18.

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ABSTRACTArchaeologists have struggled to combine remotely sensed datasets with preexisting information for landscape-level analyses. In the American Southeast, for example, analyses of lidar data using automated feature extraction algorithms have led to the identification of over 40 potential new pre-European-contact Native American shell ring deposits in Beaufort County, South Carolina. Such datasets are vital for understanding settlement distributions, yet a comprehensive assessment requires remotely sensed and previously surveyed archaeological data. Here, we use legacy data and airborne li

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Majima, Ryuichi. "Life positions of fossil naticid opercula (Mollusca: Gastropoda)." Journal of Paleontology 61, no. 1 (1987): 62–65. http://dx.doi.org/10.1017/s0022336000028201.

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Two life positions of fossil naticid opercula are recognized in Pliocene deposits of Hokkaido, northern Japan. In one position, the operculum seals the aperture. In the other position, the operculum is pressed against the shell base adjacent to the aperture. The death position of the head-foot mass can be reconstructed from the two opercular positions, which coincide, respectively, to naticids that died with the head-foot mass retracted into the shell, and those that died with it entirely extended from the shell.

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