Статті в журналах: "Paleontology Cambrian"

1

Vidal, Gonzalo. "Proterozoic and Cambrian bioevents." Spanish Journal of Palaeontology 13, no. 3 (February 27, 2022): 11. http://dx.doi.org/10.7203/sjp.23973.

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2

Fortey, Richard A. "Late Cambrian trilobites from the Sultanate of Oman." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 194, no. 1 (November 28, 1994): 25–53. http://dx.doi.org/10.1127/njgpa/194/1994/25.

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3

Jago, James B., and Peter W. Haines. "Recent radiometric dating of some Cambrian rocks in southern Australia: relevance to the Cambrian time scale." Spanish Journal of Palaeontology 13, no. 3 (February 27, 2022): 115. http://dx.doi.org/10.7203/sjp.23984.

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4

Landing, Ed, and Guy M. Narbonne. "Scenella and “a chondrophorine (medusoid hydrozoan) from the basal Cambrian (Placentian) of Newfoundland”." Journal of Paleontology 66, no. 2 (March 1992): 338. http://dx.doi.org/10.1017/s0022336000033837.

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In a recent article, Narbonne et al. (1991) documented that the stratigraphic range of the chondrophorine Kullingia delicata continues above the the uppermost Precambrian (Vendian) into the lowermost Cambrian (Placentian Series) of the Avalonian faunal province. The revised text published in the Journal of Paleontology includes several references to Scenella Billings, 1872, as a Cambrian chondrophorine. This classification is in error and unfortunately serves to reinforce several recent reports that conclude that Scenella is a chondrophorine rather than a helcionacean mollusk.

5

Waggoner, Ben, and James W. Hagadorn. "An unmineralized alga from the Lower Cambrian of California, USA." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 231, no. 1 (February 2, 2004): 67–83. http://dx.doi.org/10.1127/njgpa/231/2004/67.

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6

Chang, Wen T. "Cambrian biogeography of the Perigondwana Faunal Realm." Spanish Journal of Palaeontology 13, no. 3 (February 27, 2022): 35. http://dx.doi.org/10.7203/sjp.23977.

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7

Chang, Wen T. "Cambrian correlation within the Perigondwana Faunal Realm." Spanish Journal of Palaeontology 13, no. 3 (February 27, 2022): 23. http://dx.doi.org/10.7203/sjp.23976.

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8

Kuzmina, T. V., A. A. Ratnovskaya, and A. A. Madison. "Lophophore Evolution from the Cambrian to the Present." Paleontological Journal 55, no. 10 (December 2021): 1109–40. http://dx.doi.org/10.1134/s0031030121100051.

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9

Geyer, Gerd, and Michael Streng. "Middle Cambrian pelecypods from the Anti-Atlas, Morocco." Spanish Journal of Palaeontology 13, no. 3 (February 27, 2022): 83. http://dx.doi.org/10.7203/sjp.23980.

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10

Bordonaro, Osvaldo Luis, and Eladio Liñán Guijarro. "Some middle Cambrian agnostoids from the Precordillera Argentina." Spanish Journal of Palaeontology 9, no. 1 (August 10, 2022): 105. http://dx.doi.org/10.7203/sjp.24355.

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11

Miller, Randall F. "Location of trace fossils and problematica of George Frederic Matthew from Part W, Treatise on Invertebrate Paleontology." Journal of Paleontology 70, no. 1 (January 1996): 169–71. http://dx.doi.org/10.1017/s0022336000023210.

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George frederic matthew studied the geology of eastern Canada during the late 1800's to early 1900's and became an authority on Cambrian paleontology. Matthew advised the Geological Survey of Canada as its Cambrian expert and published over 200 papers spanning topics from Precambrian stromatolites to Pennsylvanian arthropods to archaeology (Miller, 1988a; Landing and Miller, 1988). He described a number of trace fossils and problematica cited in Hantzschel (1975), but the location of some specimens and their status has been uncertain, sometimes considered missing. Most of the specimens have now been located and this paper summarizes their current location.

12

Mayoral, Eduardo, Eladio Liñán, José Antonio Gámez Vintaned, Fernando Muñiz, and Rodolfo Gozalo. "Stranded jellyfish in the lowermost Cambrian (Corduban) of Spain." Spanish Journal of Palaeontology 19, no. 2 (March 3, 2021): 191. http://dx.doi.org/10.7203/sjp.19.2.20531.

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13

Normile, D. "PALEONTOLOGY: China Clamps Down on Mining to Preserve Cambrian Site." Science 305, no. 5692 (September 24, 2004): 1893–94. http://dx.doi.org/10.1126/science.305.5692.1893.

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14

Palmer, Allison R. "Why is intercontinental correlation within the Lower Cambrian so difficult?" Spanish Journal of Palaeontology 13, no. 3 (February 27, 2022): 17. http://dx.doi.org/10.7203/sjp.23974.

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15

Álvaro, J. Javier, and Emmanuelle Vennin. "Benthic marine communities recorded in the Cambrian Iberian platform, NE Spain." Palaeontographica Abteilung A 262, no. 1-3 (July 30, 2001): 1–23. http://dx.doi.org/10.1127/pala/262/2001/1.

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16

Lipps, Jere H. "Neoproterozoic—Cambrian Biological Revolutions." Paleontological Society Papers 10 (November 2004): 1–4. http://dx.doi.org/10.1017/s1089332600002291.

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The Neoproterozoic—Cambrian biological and geological events between 630 to 530 or so million years ago, are among the most fascinating topics in life history today because the first animals appeared and radiated amidst environmental changes of major magnitude. Not only are paleontologists and geologists interested in these events, but so are the general public, biologists, and theologians, among others. Indeed, this interest was manifested in a cover story in Time Magazine (Nash, 1995), another in the National Geographic (Monastersky, 1998), and in newspapers and other outlets. It is an intriguing time period, for most people are interested in our origins-of life itself, of animals, and of humans. The topics of this book then are nearly unique in this respect. The Paleontological Society is therefore pleased to present a Short Course and book summarizing the evidence, interpretations and hypotheses relating to this interval of time, with a focus on the origin and early evolution of the first known animals through a period of about 100 million years. Like all of the Society's Short Course books, this one is designed to provide a current review an important topic in paleontology for college instructors, interested professionals, and students. Such a book cannot cover the topics in great detail, but the authors have provided up-to-date references to additional sources.

17

Guo, Junfeng, Jian Han, Heyo Van Iten, Zuchen Song, Yaqin Qiang, Wenzhe Wang, Zhifei Zhang, and Guoxiang Li. "A ten-faced hexangulaconulariid from Cambrian Stage 2 of South China." Journal of Paleontology 95, no. 5 (March 29, 2021): 957–64. http://dx.doi.org/10.1017/jpa.2021.25.

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AbstractHexangulaconulariids (Cambrian stages 1–2) are an extinct group of medusozoan polyps having a biradially symmetrical, fan-shaped periderm that is distinct from those of medusozoan polyps showing three-, four-, five-, or six-fold radial symmetry. Hexangulaconulariids exhibit substantial variation in gross morphology, including variation in the number of faces on each of the two major sides of the periderm. An intermediate taxon of hexangulaconulariids with ten faces (five on each major side) was expected. Here we describe a new hexangulaconulariid, Decimoconularia isofacialis new genus new species from Bed 5 of the Yanjiahe Formation (Cambrian Stage 2) in the Three Gorges area of Hubei Province, China. The new taxon differs from other hexangulaconulariids (Arthrochites, Hexaconularia, and Septuconularia) mainly in possessing a total of ten faces. The two lateral margins are each marked by a ridge in about the apertural half of the periderm and by a collinear furrow in about the apical half, while the five faces on each major side are bounded by a furrow in about the apertural half and by a collinear ridge in about the apical half. Among hexangulaconulariids, Decimoconularia and Septuconularia may be more closely related to each other than either genus is to Arthrochites or Hexaconularia.UUID: http://zoobank.org/ca270a3b-25ee-4d1f-bdeb-91a963370e70

18

Demidenko, Yu E. "Microstructure of the Tubes of Cambrian Zooproblematics of the Family Hyolithellidae." Paleontological Journal 55, no. 5 (September 2021): 477–88. http://dx.doi.org/10.1134/s0031030121050038.

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19

Ling, Chenchen, Jin Peng, Hui Zhang, Yifan Wang, Yunbin Shao, Quanyi Sun, and Qiujun Wang. "Saetaspongia sponges from the Cambrian (Stage 4) Balang Formation of Guizhou, China." Journal of Paleontology 95, no. 5 (May 7, 2021): 944–56. http://dx.doi.org/10.1017/jpa.2021.29.

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AbstractSaetaspongia so far cannot be confidently assigned to any class-level crown group. Clarifying its phylogenetic position requires new information provided by more detailed studies of previously described and/or new material. Some sponge fossils with the typical skeletal architecture of Saetaspongia have recently been recognized in the Cambrian (Stage 4) Balang Biota of Guizhou, China, including S. jianhensis new species and S. cf. S. densa. The new taxon is characterized by the following features: spicules are fine monaxons and are inclined to be loosely to densely arranged into plumose arrays; skeleton is composed primarily of one major plumose bundle, with an uncertain number (perhaps two) of small plumose arrays; and primary skeleton is occasionally interspersed with some irregularly oriented individual spicules. An additional specimen consisting of large monaxons, with plumose structures and overlying irregular coarse monaxons, closely fits the description and illustrations of previously described S. cf. S. densa. By combining information from previous studies and the present research, fossil evidence indicates that the plumose architecture is a critical feature diagnostic of Saetaspongia and that there are no hexactine-based spicules in this genus. The new material from the Balang Biota further supports the notion that Saetaspongia has a protomonaxonid rather than a hexactinellid affinity. Fossil evidence suggests that Saetaspongia had a wide biogeographic distribution during the early Cambrian and the stratigraphic distribution of this genus extends up to Stage 4.UUID: http://zoobank.org/e9ca5e4a-134c-4daa-9266-19085e32614f.

20

Holm-Denoma, Christopher S., William A. Matthews, Linda K. Soar, Mark W. Longman, and James W. Hagadorn. "Provenance of Devonian–Carboniferous strata of Colorado: The influence of the Cambrian and the Proterozoic." Rocky Mountain Geology 57, no. 1 (June 1, 2022): 1–21. http://dx.doi.org/10.24872/rmgjournal.57.1.1.

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ABSTRACT We report new LA-ICP-MS U–Pb detrital zircon ages and sedimentary petrology of silty to sandy limestones and dolostones, as well as calcareous to dolomitic sandstones of the Devonian–Carboniferous (Mississippian) Chaffee Group. We also report new detrital zircon ages from the late Cambrian Sawatch Quartzite, and a U–Pb zircon crystallization age on a late Mesoproterozoic (1087.9 ± 13.5 Ma) granitoid of underlying basement from the Eagle Basin of northwest Colorado. Grain populations in the Chaffee Group are mostly bimodal. More than 84% of zircons centered around a Paleoproterozoic (ca. 1.78 Ga) mode typical of the Yavapai province that forms much of the basement of Colorado and an early Mesoproterozoic (ca. 1.42 Ga) mode typical of A-type granites that intrude this region. A notable late Mesoproterozoic (ca. 1.08 Ga) mode exists in some Chaffee samples, giving those samples a trimodal detrital zircon age distribution. These bipartite or tripartite detrital zircon age modes exist in Cambrian, Devonian, and Carboniferous strata from paleogeographically adjacent successions, but the correlation between the Chaffee zircons is highest with the region’s basal Cambrian sandstones of the Sawatch Quartzite, Flathead Sandstone, and Ignacio Quartzite, which have similar (ca. 1.08 Ga, 1.43 Ga, 1.70 Ga, respectively) zircon populations, and a paucity of > 1.8 Ga grains. This similarity suggests that most grains in the Chaffee Group derive from recycling of these basal sandstones, and that little sediment was derived directly from thenexposed Precambrian basement highs, from the Wyoming craton to the north, or from Paleoproterozoic arcs and orogens to the west and northeast. Minor Mesoarchean to early Paleoproterozoic (ca. 3.00 to 2.40 Ga) grains exist in the Chaffee Group, an attribute shared by the Late Ordovician Harding Sandstone of Colorado’s Front Range, but that is absent from the region’s underlying Cambrian sandstones—suggesting some recycled mixture of Cambrian and Ordovician sedimentary rocks. No near-depositional age grains are present in the Chaffee Group. The youngest grain is Early Devonian (~417 Ma), > 45 million years (m.y.) older than these strata. Additionally, Paleozoic grains are extremely uncommon (< 0.1%; n = 2,927 grains).

21

Koneva, S. P., and G. T. Ushatinskaya. "New Upper Cambrian Lingulata (Brachiopoda) from the Agyrek mountains (northeastern central Kazakhstan)." Paleontological Journal 42, no. 2 (March 2008): 139–48. http://dx.doi.org/10.1134/s0031030108020044.

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22

Peel, John S., and Sebastian Willman. "Cavity-dwelling microorganisms from the Ediacaran and Cambrian of North Greenland (Laurentia)." Journal of Paleontology 96, no. 2 (October 22, 2021): 243–55. http://dx.doi.org/10.1017/jpa.2021.96.

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AbstractRecords of diagenetically mineralized, filamentous, cavity-dwelling microorganisms extend back to strata from the early Paleoproterozoic (2400 Ma). In North Greenland (Laurentia), they are first known from the Ediacaran (Neoproterozoic; ca. 600 Ma) Portfjeld Formation of southern Peary Land, in association with a biota similar to that of the Doushantuo Formation of China. The Portfjeld Formation cavity dwellers are compared with more widespread occurrences in Cambrian (Series 2, Stage 4, Miaolingian Series) strata from the same region in which assemblages in postmortal shelter structures within articulated acrotretoid brachiopods and other invertebrates are common. All specimens were recovered by digestion of carbonate samples in weak acids. The described fossils are preserved as mineral encrusted threads but this diagenetic phosphatization unfortunately obscures their biological identity.

23

Peel, John S., Christian B. Skovsted, and Elise Wallet. "Morphology and ecology of the bradoriid arthropods Spinospitella and Nikolarites from the Cambrian (Series 2, Stage 4) of North Greenland (Laurentia)." PalZ 95, no. 3 (June 23, 2021): 413–27. http://dx.doi.org/10.1007/s12542-021-00569-4.

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AbstractTuberculate fragments referred to Nikolarites spasskyi are compared with a complete carapace and other material of Spinospitella from Cambrian Series 2, Stage 4 in North Greenland. The descriptions expand earlier brief records from Laurentia of the two bradoriids, originally described from Siberia and Australia, respectively. The mutually exclusive occurrences of the two taxa indicate ecological control of their distribution in North Greenland. Robust fragments of Nikolarites spasskyi occur in reworked higher energy deposits of the Aftenstjernesø Formation, while thin-walled carapaces of Spinospitella characterise deeper water mudstones within the Buen and Aftenstjernesø formations.

24

Dai, Tao, Nigel C. Hughes, Xingliang Zhang, and Shanchi Peng. "Development of the early Cambrian oryctocephalid trilobite Oryctocarella duyunensis from western Hunan, China." Journal of Paleontology 95, no. 4 (March 17, 2021): 777–92. http://dx.doi.org/10.1017/jpa.2020.111.

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AbstractAbundant articulated specimens of the oryctocarine trilobite Oryctocarella duyunensis from the lower Cambrian (Stage 4, Series 2) Balang Formation at the Bulin section in western Hunan Province, South China, permit the description of all meraspid degrees. The maximum number of thoracic segments observed in this collection is 11. Meraspid growth was accompanied by progressive and gradual change in overall form, and this animal showed an homonymously segmented trunk with variation in the number of pygidial segments during ontogeny. Such variation permits a variety of plausible explanations, but a model of successive instars defined by the number of thoracic segments, and in suborder by the number of pygidial segments, is highly unlikely to explain the growth pattern because it would result in the loss of trunk segments between some instars. Degree-based ontogenetic staging is compatible with the variation observed.

25

Liñan, Eladio, and Michal Mergl. "Lower and Middle Cambrian brachiopods from the Iberian Chains and Sierra Morena (Spain)." Spanish Journal of Palaeontology 16, no. 2 (September 21, 2021): 317. http://dx.doi.org/10.7203/sjp.16.2.21607.

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26

Parsley, R. L. "Evolution, Functional Morphology and Paedomorphism in the Gogiid-Ascocystitid Lineage (Eocrinoidea; Cambrian-Ordovician)." Paleontological Journal 55, no. 9 (December 2021): 966–76. http://dx.doi.org/10.1134/s0031030121090100.

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27

Parcha, S. K. "Biostratigraphy of the Middle Cambrian sequences of Spiti Himalaya and its correlation with analogous sequences in Kashmir Himalaya." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 209, no. 2 (August 18, 1998): 231–46. http://dx.doi.org/10.1127/njgpa/209/1998/231.

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28

Mergl, M., G. Geyer, and A. El Attari. "The billingsellid genus Saccogonum (Brachiopoda) from the Moroccan Cambrian and its significance for the regional geology and stratigraphy." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 209, no. 3 (September 7, 1998): 273–93. http://dx.doi.org/10.1127/njgpa/209/1998/273.

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29

Handkamer, Neal M., Brian R. Pratt, and Robert B. MacNaughton. "Biostratigraphy and paleoecology of the trilobite faunas from the Mount Clark and Mount Cap formations (early and middle Cambrian), eastern Mackenzie Mountains, northwestern Canada." Journal of Paleontology 96, S89 (June 2022): 1–47. http://dx.doi.org/10.1017/jpa.2022.13.

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AbstractLower and middle Cambrian strata of the eastern Mackenzie Mountains, Northwest Territories, Canada, were deposited in a semi-enclosed basin along the eastern flank of the Mackenzie Arch. The Mount Clark Formation is predominantly composed of nearshore sandstone and is overlain by deeper water siltstone, mudstone, and carbonates of the Mount Cap Formation. The contact between these formations is interpreted as a flooding surface. Trilobite biostratigraphy indicates the presence of the traditional upper Olenellus through Glossopleura zones (Cambrian Series 2, Stage 4–Miaolingian, Wuliuan) and suggests the flooding surface is diachronous, spanning the Dyeran-Delamaran boundary. Above the Olenellus Zone, the Amecephalus arrojosensis-Eokochaspis nodosa Zone, the new Aitkenaspis keelensis Zone, the new Albertelloides mischi Zone, and the Glossopleura walcotti Zone are recognized. Whereas the older zones are comparable to those in other areas of Laurentia, the trilobite faunas in the Albertelloides mischi and Glossopleura walcotti zones show a greater abundance of zacanthoidids and dolichometopids. They also have a lower diversity of ptychoparioids and oryctocephalids, and lack agnostoids, eodiscoids, dorypygids, and ogygopsidids. This suggests that zacanthoidids and dolichometopids were able to tolerate conditions that were unfavorable to the other groups, probably related to semi-restricted conditions in the basin. Four endemic species exhibit characteristics that are considered paedomorphic. This developmental process took place in three separate lineages, suggesting that heterochrony was also environmentally provoked.New taxonomic names are authored by Handkamer and Pratt. New genera are Eobathyuriscus, Sahtuia, Mexicaspidella Aitkenaspis, Dodoella, and Mackenzieaspis. New species are Bolbolenellus dodoensis, Eobathyuriscus mackenziensis, E. macqueeni, Glossopleura youngi, Sahtuia carcajouensis, Aitkenaspis keelensis, Albertelloides eliasi, Dodoella kobayashii, Mackenzieaspis parallelispinosa, and M. divergens.UUID: http://zoobank.org/a10a2470-853c-4ce8-bf62-7de1d2c99fab.

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Novozhilova, N. V. "Early Cambrian Palaeoscolecidan Sclerites from the Western Limb of the Chekurovka Anticline (Siberian Platform)." Paleontological Journal 56, no. 2 (April 2022): 147–53. http://dx.doi.org/10.1134/s0031030122020095.

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Wills, Matthew A. "Cambrian and Recent disparity: the picture from priapulids." Paleobiology 24, no. 2 (1998): 177–99. http://dx.doi.org/10.1666/0094-8373(1998)024[0177:cardtp]2.3.co;2.

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Abstract An understanding of several macroevolutionary trends has been greatly advanced in recent years by a focus on disparity (morphological variety) rather than taxic diversity. A seminal issue has been the nature of the Cambrian Radiation, and the question of whether problematical Cambrian fossils embody a range of anatomical design far exceeding that observed thereafter. Arthropods have hitherto furnished the only case study, revealing comparable levels of Cambrian and Recent disparity. The generality of this observation needs to be tested in other groups, and the priapulid worms provide a well-documented example. Cladistic analysis of morphological characters for priapulids reveals a paraphyletic series of Cambrian taxa below a crown-group of post-Cambrian genera. However, one extant family (the Tubiluchidae) may be more closely related to Cambrian forms or resolve basally. Character-based morphospace analysis demonstrates greater disparity amongst Recent taxa than amongst their Cambrian counterparts. There is relatively little overlap between the regions of morphospace occupied by Cambrian and Recent genera (contrasting with the situation in arthropods). The Tubiluchidae are morphologically intermediate between Cambrian and other Recent families using several measures of phenetic proximity, and they inhabit environments more comparable with their Cambrian cousins. This work confirms the extensive morphological diversification of major clades by the Cambrian but lends no support to models of a post-Cambrian “decimation” of disparity.

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Popov, Leonid E., Olga I. Nikitina, Tatiana E. Pirogova, and Gappar Kh Ergaliev. "Cambrian brachiopods from the area of the former Semipalatinsk nuclear-testing site, Chingiz Ranges, Kazakhstan." PalZ 95, no. 2 (February 10, 2021): 275–90. http://dx.doi.org/10.1007/s12542-020-00540-9.

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33

Peel, John S. "An outer shelf shelly fauna from Cambrian Series 2 (Stage 4) of North Greenland (Laurentia)." Journal of Paleontology 95, S83 (April 2021): 1–41. http://dx.doi.org/10.1017/jpa.2020.112.

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AbstractAn assemblage of 50 species of small shelly fossils is described from Cambrian Series 2 (Stage 4) strata in North Greenland, the present day northernmost part of the paleocontinent of Laurentia. The fossils are derived from the basal member of the Aftenstjernesø Formation at Navarana Fjord, northern Lauge Koch Land, a condensed unit that accumulated in a sediment-starved outer ramp setting in the transarctic Franklinian Basin, on the Innuitian margin of Laurentia. Most other small shelly fossil assemblages of similar age and composition from North America are described from the Iapetan margin of Laurentia, from North-East Greenland south to Pennsylvania. Trilobites are uncommon, but includeSerrodiscus. The Australian bradoriidSpinospitellais represented by a complete shield.Obolella crassais the only common brachiopod. Hyoliths, includingCassitella,Conotheca,Neogloborilus, andTriplicatella, are abundant and diverse, but most are represented just by opercula. Sclerites interpreted as stem-group aculiferans (sachitids) are conspicuous, includingQaleruaqia, the oldest described paleoloricate,Ocruranus?,Inughuitoconusn. gen., andHippopharangites. Helcionelloid mollusks are diverse, but not common; they are associated with numerous specimens of the bivalvePojetaia runnegari. The fauna compares best with that of the upper Bastion Formation of North-East Greenland, the Forteau Formation of western Newfoundland, and the Browns Pond Formation of New York, but several taxa have a world-wide distribution. Many specimens are encrusted with crystals of authigenic albite. New species:Anabarella?navaranae,Stenotheca?higginsi,Figurina?polaris,Hippopharangites groenlandicus,Inughuitoconus borealis, andOcruranus?kangerluk.UUID:http://zoobank.org/160a17b1-3166-4fcf-9849-a3cabd1e04a3

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Wotte, Thomas. "New Middle Cambrian molluscs from the Láncara Formation of the Cantabrian Mountains (north-western Spain)." Spanish Journal of Palaeontology 21, no. 2 (February 26, 2021): 145. http://dx.doi.org/10.7203/sjp.21.2.20487.

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35

Alekseeva, T. V., A. O. Alekseev, and G. V. Mitenko. "A Paleosol on a Pre-Cambrian Ferruginous Quartzite Weathering Crust (Stary Oskol, Belgorod Region, Russia)." Paleontological Journal 55, no. 12 (December 2021): 1476–90. http://dx.doi.org/10.1134/s0031030121120054.

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36

Braun, Andreas. "Prospective Lithologies, Techniques and Chances for Microscopic Paleontology at the Vendian/Cambrian Boundary." Gondwana Research 7, no. 3 (July 2004): 675–84. http://dx.doi.org/10.1016/s1342-937x(05)71055-8.

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37

Repetski, J. E., M. E. Taylor, D. S. Collins, A. R. Palmer, G. D. Wood, and R. C. Tobin. "Integrating paleontology, geothermometry, and sedimentology in determining the history of the Reelfoot Basin, southern midcontinent, U.S.A." Paleontological Society Special Publications 6 (1992): 243. http://dx.doi.org/10.1017/s2475262200008030.

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The northeast-trending Reelfoot basin, extending from northeast Arkansas and westernmost Tennessee into southeastern Missouri, southernmost Illinois, and westernmost Kentucky, is geologically, and socioeconomically, significant because it is co-extensive with the New Madrid Seismic Zone, one of the most seismically active areas of the central and eastern United States. The basin has been periodically active from its inception as a rift basin in the Proterozoic to the present and has accumulated up to at least 5,000 m of sediment, including up to at least 1 km of Cretaceous and Tertiary sedimentary strata near the head of the Mississippi Embayment. Structural and stratigraphic interpretations within the subsurface pre-Mesozoic part of the basin have been based almost entirely on geophysical and physical stratigraphic criteria; these interpretations have been loosely constrained due to an extreme sparsity of drillhole data through the Paleozoic sequence. Recent analysis of Cambrian and Ordovician fossils (conodonts, palynomorphs, brachiopods, and trilobites) from cuttings and core from a very few drillholes allows establishment of the beginnings of a verifiable stratigraphy for this part of the sequence. The paleontological data also provide (1) biofacies evidence for interpretations of the depositional setting during part of the Late Cambrian and Early Ordovician interval and (2) thermal maturation data pertaining to the post-depositional geothermal history of these strata.Upper Cambrian phosphatic brachiopods and trilobites provide improved correlations between strata in the basin, the Ozark shelf to the northwest, and the Upper Mississippi River Valley. Cold-water-realm palynomorphs and trilobites from siliciclastic rocks of turbiditic origin in the central part of the Reelfoot basin support an interpretation, based on sedimentary structures in a short interval of core, of a deep-water basinal origin for these strata.Lower Ordovician conodonts provide a biostratigraphy for the carbonate rocks of this part of the sequence; correlations can be made with the shallow-water sequences of the Knox, Prairie du Chien, and Arbuckle Groups, and the Ozark sequence of the adjacent shelf areas to the east, north, and west. The uppermost Lower Ordovician strata in the basin record a short-term incursion of cooler water environments, reflected by the character of both the conodont fauna and the lithofacies. The youngest Paleozoic dates known from the basin south of the Pascola arch are latest Ibexian (Early Ordovician).Thermal alteration indices of both the Cambrian palynomorphs (organic-walled microphytoplankton) and Ordovician conodonts in the deeper parts of the basin, corroborated by fluid inclusion thermometry, vitrinite reflectance, and other geochemical techniques, are of higher values than predicted using any published estimates of overburden burial. These maturation values most likely reflect burial enhanced by the passage of hydrothermal fluids on a regional scale; they place constraints on interpretations of the tectonothermal evolution of the basin.

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Ushatinskaya, G. T., and I. V. Korovnikov. "Revision of the Order Paterinida (Brachiopoda) from the Lower and Middle Cambrian of the Siberian Platform." Paleontological Journal 55, no. 6 (November 2021): 625–40. http://dx.doi.org/10.1134/s0031030121060137.

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39

Golubkova, E. Yu, E. A. Kushim, O. F. Kuzmenkova, and A. G. Laptsevich. "Early Cambrian Biotas of the South of the Latvian Saddle of the Eastern European Platform, Belarus." Paleontological Journal 56, no. 6 (December 2022): 693–701. http://dx.doi.org/10.1134/s0031030122060053.

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40

Chirivella Martorell, Juan B., Rodolfo Gozalo, and Eladio Liñan. "El género Parabailiella Thoral, 1946 (Trilobita) en el Cámbrico Medio de las cadenas ibéricas (NE de España)." Spanish Journal of Palaeontology 24, no. 2 (February 12, 2021): 171. http://dx.doi.org/10.7203/sjp.24.2.20354.

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Se analiza el registro del género Parabailiella Thoral, 1946 en el Cámbrico medio de las Cadenas Ibéricas, al tiempo que se identifican y describen por primera vez en la región las cuatro especies que previamente se habían incluido en este género. La mayoría de las especies se encuentran registradas en varias secciones y las cuatro se han identificado en la sección Jarque 1. La distribución bioestratigráfica del género abarca desde el Leoniense medio hasta la base del Caesaraugustiense superior, lo que equivale en la escala propuesta por la International Subcommission on Cambrian Stratigraphy (ISCS) a la mayor parte del Piso 5 del Cámbrico y a la parte inferior del Piso Drumiense. La distribución paleogeográfica del género es exclusiva de la región Mediterránea, concretamente de la Plataforma Europea de la región perigondwánica.

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Hildenbrand, Anne, Gregor Austermann, Christina Ifrim, and Peter Bengtson. "Biostratigraphy and taxonomy of Drumian (middle Cambrian) agnostid trilobites of the Manuels River Formation, Avalonian Newfoundland, Canada." Papers in Palaeontology 7, no. 3 (March 25, 2021): 1657–98. http://dx.doi.org/10.1002/spp2.1358.

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42

Duan, Xiaolin, Marissa J. Betts, Lars E. Holmer, Yanlong Chen, Fan Liu, Yue Liang, and Zhifei Zhang. "Early Cambrian (Stage 4) brachiopods from the Shipai Formation in the Three Gorges area of South China." Journal of Paleontology 95, no. 3 (February 22, 2021): 497–526. http://dx.doi.org/10.1017/jpa.2020.117.

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AbstractDiverse and abundant fossil taxa have been described in the lower Cambrian Shipai Formation in the Three Gorges area of Hubei Province, South China, but the taxonomy and diversity of the co-occurring brachiopod fauna are still far from clear. Here we describe the brachiopod fauna recovered from the Shipai Formation in the Three Gorges area of South China, including representatives of the subphylum Linguliformea: linguloids (Lingulellotreta ergalievi, Eoobolus malongensis, and Neobolidae gen. indet. sp. indet.), and an acrotretoid (Linnarssonia sapushanensis); and representatives from the subphylum Rhynchonelliformea: the calcareous-shelled Kutorginates (Kutorgina sinensis, Kutorgina sp., and Nisusia liantuoensis). This brachiopod assemblage and the first occurrence of Linnarssonia sapushanensis shell beds permit correlation of the Shipai Formation in the Three Gorges area of Hubei Province with the Stage 4 Wulongqing Formation in the Wuding area of eastern Yunnan. This correlation is further strengthened by the first appearance datum (FAD) of the rhynchonelliform brachiopod Nisusia in the upper silty mudstone of both the Shipai and Wulongqing formations. The new well-preserved material, derived from siliciclastic rocks, also gives critical new insights into the fine shell structure of L. sapushanensis. Microstructural studies on micromorphic acrotretoids (like Linnarssonia) have previously been restricted to fossils that were acid-etched from limestones. This is the first study to carry out detailed comparative ultrastructural studies on acrotretoid shells preserved in siliciclastic rocks. This work reveals a hollow tube and solid column microstructure in the acrotretoid shells from the Shipai Formation, which is likely to be equivalent of traditional column and central canal observed in shells dissolved from limestones.

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Yang, Kaiyu, Tao Dai, Xingliang Zhang, and Shanchi Peng. "Trunk regionalization and functional morphology of the globally distributed trilobite Bathynotus from Cambrian Series 2 of China." PalZ 95, no. 3 (June 2, 2021): 373–85. http://dx.doi.org/10.1007/s12542-021-00557-8.

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44

Zhuravlev, Andrey. "Outlines of the Siberian Platform sequence stratigraphy in the Lower and lower Middle Cambrian (Lena-Aidan area)." Spanish Journal of Palaeontology 13, no. 3 (February 27, 2022): 105. http://dx.doi.org/10.7203/sjp.23983.

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45

Palacios, Teodoro, and Malgorzata Moczydlowska. "Acritarch biostratigraphy of the Lower-Middle Cambrian boundary in the Iberian Chains, province of Soria, northeastern Spain." Spanish Journal of Palaeontology 13, no. 3 (February 27, 2022): 65. http://dx.doi.org/10.7203/sjp.23979.

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46

Hernick, Linda. "Silas Watson Ford: A Major But Little-Known Contributor to the Cambrian Paleontology of North America." Earth Sciences History 18, no. 2 (January 1, 1999): 246–63. http://dx.doi.org/10.17704/eshi.18.2.71355x54266626l1.

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Silas Watson Ford (1848-1895), telegrapher and paleontologist born in Glenville, New York, in 1848, made significant contributions to Cambrian paleontology from 1871 to 1888. The focus of his work was the allochthonous Taconic rock that lies east of the Hudson River in easternmost New York. His discovery of a ‘Primordial’ fauna in this region was instrumental in helping to resolve the uncertainty surrounding the age of this older portion of the Taconics. While most of his papers were published in the American Journal of Science, a series of seven papers on the ‘Silurian Age’ was published by the New York Tribune in 1879. For this work he was subsequently awarded an honorary master's degree by Union College.Ford was hired by his contemporary, Charles Doolittle Walcott (1850-1927), to work for the U.S. Geological Survey from 1884 to 1885. Highly regarded by James Hall (1811-1898), James Dwight Dana (1813-1895), Joachim Barrande (1799-1883), and many other prominent geologists of the time, he was often consulted for his expertise in collecting and describing Cambrian-age fossils.While Walcott's career continued to flourish, Ford faded into obscurity after 1888. Plagued by personal problems, he was forced to give up his personal library, his fossil collection, and finally, his career. He died in 1895 at the age of 47, with his passing virtually unnoticed by his professional colleagues.

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Peel, John S. "Eldoradia and Acrocephalops (Trilobita: Bolaspididae) from the middle Cambrian (Miaolingian) of northern Greenland (Laurentia)." GFF 143, no. 1 (January 2, 2021): 8–15. http://dx.doi.org/10.1080/11035897.2020.1865446.

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48

Zhu, Mao-Yan, Loren E. Babcock, and Shan-Chi Peng. "Advances in Cambrian stratigraphy and paleontology: Integrating correlation techniques, paleobiology, taphonomy and paleoenvironmental reconstruction." Palaeoworld 15, no. 3-4 (August 2006): 217–22. http://dx.doi.org/10.1016/j.palwor.2006.10.016.

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49

Elicki, Olaf. "First report of Halkieria and enigmatic globular fossils from the Central European Marianian (Lower Cambrian, Gorlitz Syncline, Germany)." Spanish Journal of Palaeontology 13, no. 3 (February 27, 2022): 51. http://dx.doi.org/10.7203/sjp.23978.

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50

Wu, Yu, Dongjing Fu, Jiaxin Ma, Weiliang Lin, Ao Sun, and Xingliang Zhang. "Houcaris gen. nov. from the early Cambrian (Stage 3) Chengjiang Lagerstätte expanded the palaeogeographical distribution of tamisiocaridids (Panarthropoda: Radiodonta)." PalZ 95, no. 2 (May 28, 2021): 209–21. http://dx.doi.org/10.1007/s12542-020-00545-4.

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