Relevant bibliographies by topics / Early Ordovician

Academic literature on the topic 'Early Ordovician'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Early Ordovician"

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MALETZ, JORG, and DAVID L. BRUTON. "The Beothuka terranova (Radiolaria) assemblage and its importance for the understanding of early Ordovician radiolarian evolution." Geological Magazine 142, no. 6 (November 2005): 711–21. http://dx.doi.org/10.1017/s0016756805001391.

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The radiolarian Beothuka terranova occurs in the Arenigian Didymograptellus bifidus Biozone (uppermost Lower Ordovician) of Spitsbergen (Svalbard), associated with a diverse and well-preserved radiolarian fauna. The presence of typical Cambrian spicular radiolarians associated with derived spherical forms shows a gradational faunal change from the Cambrian to the Ordovician. The genus and species Antygopora ordovicica n. gen. et n. sp. is described.
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Zhang, Yuandong, Bernd-D. Erdtmann, and Hongzhen Feng. "Tremadocian (Early Ordovician) graptolite biostratigraphy of China." Newsletters on Stratigraphy 40, no. 3 (December 22, 2004): 155–82. http://dx.doi.org/10.1127/0078-0421/2004/0040-0155.

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Retallack, Gregory J. "Ordovician Life on Land and Early Paleozoic Global Change." Paleontological Society Papers 6 (November 2000): 21–46. http://dx.doi.org/10.1017/s1089332600000693.

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Many Paleontologists share the opinion of McGhee (1996), who wrote “Prior to the Devonian, there was no terrestrial ecosystem to speak of. Some primitive plants precariously establishing a beachhead in protected coastal areas was about it. The interiors of the continents of the planet Earth were as barren as the rocky landscapes of Mars.” Thus, it was with trepidation that I reported paleosols containing trace fossils of early land animals in the late Ordovician, Juniata Formation, of Pennsylvania (Retallack and Feakes, 1987; Retallack, 1992a, 1992b, 1993). My late colleague, Jane Gray, engendered considerable debate by reporting Ordovician and Early Silurian spores like those of liverworts (Gray and Boucot, 1977; Gray, 1985). This spore, trace fossil and paleosol evidence for life on land in the Ordovician has remained controversial (Buatois et al., 1998; Shear, 1998), but evidence for Ordovician life on land has continued to accumulate. Especially important was discovery of myriapod trackways from mid-Ordovician (Llandeilian-Caradocian) Borrowdale Volcanics of the Lake District, England (Johnson et al., 1994). Abundant arthropod burrows and tracks, and a single body fossil of an euthycarcinoid in the fluvial-eolian Tumblagooda Sandstone of Western Australia (White 1990; McNamara and Trewin, 1993; Trewin and McNamara, 1995) are now thought to be late Ordovician in age (Iaksy et al., 1998). An enigmatic assemblage of arthropods and plants from a mid-Ordovician paleokarst in Tennessee (Caster and Brooks, 1956) is now thought to have been lacustrine (Gray, 1988a). The fossil record of Ordovician land plants also has improved with the discovery of possible megafossil mosses (Snigirevskaya et al. 1992), and possible late Ordovician trilete spores (Nøhr-Hansen and Koppelhus, 1998; Richardson 1988; Strother, 1991; Strother et al., 1996). But the most abundant evidence for Ordovician life on land remains fossil soils, now exploited by increasingly thorough and sophisticated studies (Retallack, 1985, 1992a, 1992b, 1993; Feakes et al., 1989; Driese and Foreman 1991, 1992a, 1992b; Driese et al., 1992, 1997; Mora et al., 1991, 1996; Mora and Driese, 1993; Yapp and Poths, 1992, 1994, 1996; Yapp, 1993, 1996). Mounting evidence from fossils and paleosols now presents an increasingly detailed view of Ordovician ecosystems on land.
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Sprinkle, James, and Thomas E. Guensburg. "Early radiation of echinoderms." Paleontological Society Papers 3 (October 1997): 205–24. http://dx.doi.org/10.1017/s1089332600000267.

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Echinoderms underwent a major two-part radiation that produced all of the major groups found in the fossil record between the Early Cambrian and the Middle Ordovician. A small initial radiation in the Early and Middle Cambrian produced about nine classes containing low-diversity members of the Cambrian Evolutionary Fauna. These were characterized by primitive morphology, simple ambulacral feeding structures, and the early development of a multiplated stalk or stem for attachment to skeletal fragments on a soft substrate. Several groups became extinct at the end of the Middle Cambrian, leaving the Late Cambrian as a gap of very low diversity in the fossil record of echinoderms with only four classes preserved and very few occurrences of complete specimens, mostly associated with early hardgrounds. The survivors from this interval re-expanded in the Early Ordovician and were joined by many newly evolved groups to produce a much larger radiation of more advanced, diverse, and successful echinoderms representing the Paleozoic Evolutionary Fauna on both hard and soft substrates. At least 17 classes were present by the Middle Ordovician, the all-time high point for echinoderm class diversity, and nearly all of the major ways-of-life (except for deep infaunal burrowing) had been developed. With the rise to dominance of crinoids, many less successful or archaic groups did not survive the Middle Ordovician, and echinoderm class diversity dropped further because of the mass extinction at the end of the Ordovician. This weeding-out process of other less-successful echinoderm groups continued throughout the rest of the Paleozoic, and only five classes of echinoderms have survived to the Recent from this early Paleozoic radiation.
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Runnegar, Bruce. "Origin and Early History of Mollusks." Notes for a Short Course: Studies in Geology 13 (1985): 17–32. http://dx.doi.org/10.1017/s027116480000107x.

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Fossil mollusks are common and conspicuous objects in shallow marine strata of Ordovician and younger ages, and so the broad features of the post-Cambrian history of the Mollusca have been known for many years. However, as all but one of the eight classes of the Mollusca had evolved by the beginning of the Ordovician, it is obvious that the pre-Ordovician history of the Mollusca holds the key to an understanding of the primary radiation of the phylum. It was with this view in mind, that John Pojeta, Jr. and I began our joint studies of Cambrian mollusks some 13 years ago.
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Norford, B. S., and M. P. Cecile. "Ordovician emplacement of the Mount Dingley Diatreme, Western Ranges of the Rocky Mountains, southeastern British Columbia." Canadian Journal of Earth Sciences 31, no. 10 (October 1, 1994): 1491–500. http://dx.doi.org/10.1139/e94-132.

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External and internal morphologies are well shown by a newly discovered diatreme that is exceptionally well exposed in a cirque within the north face of Mount Dingley. The diatreme contains abundant brecciated host rocks mixed with highly altered, fine-grained, light-green igneous fragments (minerals include muscovite, chlorite, quartz, carbonate, and some remnant K-feldspar). The diatreme cuts Lower Ordovician rocks of the McKay Group. Olistostromes and other volcaniclastic rocks that are directly associated with the diatreme are bevelled beneath a regional unconformity below the Upper Ordovician Beaverfoot Formation. Lower Ordovician gastropods are present just below the volcaniclastic rocks and within what appears to be a lens of sediment within one of the olistostrome beds. These occurrences indicate a mid-Early Ordovician time of intrusion, but there is the possibility that the pipe was emplaced later within the interval mid-Early to early Late Ordovician. In the Western Ranges, three other episodes of emplacement of diatremes have been documented previously as within the intervals early Middle to early Late Ordovician, latest Early Silurian to early Middle Devonian, and Late Permian. Many of the diatremes are broadly contemporaneous with widespread, but volumetrically small, Ordovician and Lower Paleozoic volcanic and intrusive rocks found throughout the Canadian Cordillera. These volcanic and intrusive rocks have been interpreted as evidence of continued Lower Paleozoic extensional tectonism and some are associated with large base-metal deposits.
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Blake, Daniel B., Forest J. Gahn, and Thomas E. Guensburg. "Two new early Asteroidea (Echinodermata) and early asteroid evolution." Journal of Paleontology 94, no. 4 (April 2, 2020): 734–47. http://dx.doi.org/10.1017/jpa.2020.7.

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AbstractAerliceaster nexosus n. gen. n. sp. (Echinodermata), one of the oldest of known asteroids, is based on six specimens from the Floian (Early Ordovician) Garden City Formation of Idaho, and Kolataster perplexus n. gen. n. sp. is based on two specimens from the Sandian (Late Ordovician) Mifflin Formation of Illinois. Although the asterozoan skeleton is subdivided into few ossicular categories, evolutionary derivations of all the categories are not fully established, and therefore published evaluations differ. Beginning with phylogenetic work placing asteroid ancestry within the Somasteroidea together with the new taxa described herein, aspects of early asteroid morphology are evaluated and ambiguities in need of further study identified. Uncertainties are considered to be founded in rapid early asterozoan diversification and the scanty fossil record.UUID: http://zoobank.org/b43d07cc-c8fb-4a84-bc6f-40aa6e0daea2
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Harland, W. Brian. "Chapter 14 Cambrian-Ordovician history." Geological Society, London, Memoirs 17, no. 1 (1997): 257–71. http://dx.doi.org/10.1144/gsl.mem.1997.017.01.14.

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Cambrian-Ordovician history is well documented in Svalbard with late Early Cambrian faunas and a range of Ordovician faunas to provide a basis for correlation. Not so extensive as Vendian, the rocks crop out in four areas: (i) only slightly deformed strata in the youngest Hecla Hoek (Oslobreen) Group in northeastern Svalbard yield especially rich Early to Mid-Ordovician faunas, (ii) The Hornsundian Geosyncline in south Spitsbergen with more variable facies and tectonic complications also exhibits Early Cambrian and Canadian strata, (iii) The Bjornoya succession reveals a marked hiatus between Vendian and Early and Mid-Ordovician strata, (iv) In western Svalbard the lack of Cambrian and Early Ordovician strata marks a distinct Mid Ordovician tectono-thermal event to be followed by ?Late Ordovician and Early Silurian strata. Indeed the above four areas correspond to distinct terranes which, having different affinities especially with areas in Greenland, give evidence of relatively distant areas and environments of formation. Evidence of Cambro-Ordovician volcanism is not recorded.Figure 14.1 lists the successions in the four areas mentioned according to the classification of rock units as abstracted from chapters 6, 7, 8, 9, 10 and 11, where their regional settings may be found. The outcrops are plotted on Fig. 14.2. The northeastern Svalbard strata are separated by Hinlopenstretet. This waterway divides Ny Friesland and Olav V Land in Spitsbergen from northwestern Nordaustlandet and occupies a syncline, but the successions although differently named are essentially continuous. In southern Spitsbergen the fjord Hornsund separates the successions to the south in Sorkapp Land
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QUINTON, PAGE C., LAURA SPEIR, JAMES MILLER, RAYMOND ETHINGTON, and KENNETH G. MACLEOD. "EXTREME HEAT IN THE EARLY ORDOVICIAN." PALAIOS 33, no. 8 (August 14, 2018): 353–60. http://dx.doi.org/10.2110/palo.2018.031.

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Vavrdová, Milada. "Early Ordovician provincialism in acritarch distribution." Review of Palaeobotany and Palynology 98, no. 1-2 (November 1997): 33–40. http://dx.doi.org/10.1016/s0034-6667(97)00023-7.

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Dissertations / Theses on the topic "Early Ordovician"

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Montañez, Isabel Patricia. "Regional dolomitization of Early Ordovician, Upper Knox Group, Appalachians." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54248.

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The Early Ordovician, Upper Knox Group consists of meter-scale shallowing-upward cycles that were deposited on a low-sloping ramp. Cycles formed in response to short term (<100 k.y.) eustatic sea-level fluctuations and typically have well developed tidal flat caps. Cycles are bundled into five transgressive-regressive sequences which correspond to third order (1-10 m.y.) sea-level fluctuations defined by Fischer plots. The Upper Knox Group is 90% dolomite of which greater than 75% predates Middle Ordovician, Knox Unconformity development. Early dolomitization occurred penecontemporaneously with tidal flat progradation during fifth-order (up to 100 k.y.) sea-level falls as indicated by: abundant dolomite in cycles with well-developed tidal flat caps and scarce dolomite in cycles with no or thin laminite caps; decrease in dolomite abundance with distance below tidal flat caps; dolomitized cycles decrease basinward; and dolomite clasts veneer cycle tops and the Knox Unconformity surface. Third-order sea-level fluctuations also strongly controlled early dolomitization as indicated by Fischer plots; limestone, subtidal-dominated cycles correspond to third-order sea level rises and completely dolomitized, peritidal-dominated cycles correspond to third-order sea level falls. "Early" dolomite was metastable and its geochemical composition was modified during initial stabilization by marine brines during progradation of each cycle, and by mixed fresh/marine waters of the Knox aquifer associated with unconformity development. Much "early" dolomite however, remained metastable into the deep burial environment where it was replaced and overgrown by burial fluids as suggested by: covariant trends between crystal size, mole % CaCO₃, Sr²⁺, Mn²⁺ and δ¹⁸O; similar regional trends defined by stable isotope values of "early" dolomites and burial dolomites; and water-rock modeling of trace element and stable isotopic trends. Trace element and stable isotope compositions of least-altered "early" dolomite however, record a memory of a precursor evaporative dolomite. Cathodoluminescent dolomite stratigraphy defines five generations of burial dolomite that can be correlated over 100,000 km². Burial dolomites postdate a regional dissolution event attributed to migration of organic acid-rich fluids through the Knox carbonates. Regional dolomitization occurred coeval with Late Paleozoic deformation and was closely associated with MVT mineralization and hydrocarbon migration. The δ¹⁸O values and trace element contents of burial dolomites in conjunction with fluid inclusions, suggest that burial fluids were warm (135 to 200°C), saline (13 to 22 wt. % NaCl equiv.), ¹⁸O-enriched (+2 to +9 % SMOW) fluids with geochemical compositions similar to present day basinal brines. Mn²⁺ and Fe²⁺ contents of the dolomites suggest a redox control over Mn and Fe fluid chemistry, and in conjunction with regional δ¹³C trends, likely record precipitation from organic acid-rich fluids. Regional trace element and δ¹⁸O trends record a basinal fluid source and regional northwestward flow. Stable isotope values of burial dolomites and fluid inclusions from dolomites and associated minerals, define a prograderetrograde sequence that formed during basinwide, gravity-driven fluid flow which developed in response to Late Paleozoic thrusting and uplift.
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Dresbach, Russell Ivan. "Early ordovician conodonts and biostratigraphy of the Arbuckle group in Oklahoma /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9901233.

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Turvey, Samuel Thomas. "Early Ordovician (Arenig) trilobites of the South China Plate : taxonomy, palaeoecology and palaeobiogeography." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249304.

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Tomescu, Alexandru Mihail Florian. "Late Ordovician - Early Silurian terrestrial biotas of Virginia, Ohio, and Pennsylvania : an investigation into the early colonization of land /." Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1108479418.

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Tapanila, Leif Michael. "Bioerosion in late Ordovician and early Silurian tropical carbonate settings of Anticosti Island, Québec, Canada." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ61303.pdf.

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Leng, Melanie Jane. "Late Ordovician-early Silurian palaeo-environmental analysis in the Tywyn-Corris area of mid-Wales." Thesis, Aberystwyth University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388533.

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Pärnaste, Helje. "Early ordovician trilobites of suborder Cheirurina in Estonia and NW Russia : systematics, evolution and distribution /." Online version, 2004. http://dspace.utlib.ee/dspace/bitstream/10062/691/5/parnaste.pdf.

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Deline, Bradley. "The Effects of Scale, Community Structure, and Environment on Ordovician through Early Silurian Laurentian Crinoid Disparity." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1258392774.

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Moore, Richard Maurice. "The Skiddaw Group of Cumbria : early Ordovician Turbidite sedimentation and provenance on an evolving microcontinental margin." Thesis, University of Leeds, 1992. http://etheses.whiterose.ac.uk/487/.

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During the Early Palaeozoic, the southern British Isles were part of a microcontinent Eastern Avalonia. In the early Ordovician Eastern Avalonia was close to the continent of Gondwana. in high southern latitudes. Northward drift of Eastern Avalonia during the Ordovician brought it towards Baltica and Laurentia, resulting in continental collision in the Silurian. Three major tectonic events have been postulated in the earlier history of the microcontinent rifting from Gondwana, onset of subduction and subduction of the mid-ocean ridge. Evidence for such events may be sought in the contemporaneous sedimentary basins: their type and geometry and the depositional environment and composition of their sediment fill. The Skiddaw Group (Tremadoc to Llanvirn) of Cumbria. comprises turbidites. debrites and a major olistostrome. Sediment was sourced from an orogenic terrain with noncoeval continental volcanic arcs, unroofed plutons, metamorphic basement and sedimentary cover. An additional source of quartzose sediment (e.g. a sandy shelf or delta) was present Two periods of submarine fan development display the following facies associations: depositional lobe, lobe fringe and interlobe, distributary channel, and proximal channel-levee. The first spans the Tremadoc-Arenig boundary and channels distributed sediment to both east and west Axial flow along a trough orientated approximately east-west is inferred. Contemporaneous depositional lobe fades association in the Isle of Man could represent a more distal portion of this system. The Manx Group displays sediment of similar facies and compositions to the Skiddaw Group. Turbidity current flow on a submarine fan of Arenig age was strongly influenced by sea floor topography. A palaeocurrent interpretation is presented which uses the theory of oblique reflection of turbidity currents (Kneller, Edwards, McCaffrey and Moore, 1991). The angular relationship between sole mark current directions and ripple current directions is used to infer the orientation of intra-basinal topographical features. With additional evidence from thickness variations of sandstone bodies and the orientation of pre-mid Ordovician faults, a tectonic model of syn-depositional extensional faults trending northnorthwest, with fault blocks tilted to the northeast is proposed. The controls of fan development are discussed. Gravitational deformation in the Llanvirn is expressed as slump folds in partially lithified sediment, debrites and an olistostrome with sandstone rafts. Slump fold orientations are used to demonstrate the development of a regional westerly palaeoslope which preceded uplift of the depositional basin prior to subaerial volcanism of the Eycott and Borrowdale volcanic groups. The undated Ingleton Group is described and contrasted with the Skiddaw and Manx Groups. A lithological correlation with Arenig sediments recovered from the Beckermonds Scar borehole is supported, but a continental margin volcanic arc provenance and deposition as a coarse grained lobe of a submarine fan suggests the dispersal system was separate from that of the Skiddaw Group. Lithological comparison is made with contemporaneous strata of southeast Ireland. With consideration of early Ordovician geology across the Southern British Isles, a tectonic model is proposed which incorporates transtensional and transpressional phases of oblique sinistral slip in the overriding plate above a subduction zone of general southerly dip. The present day active margin of Chile is used as an analogue. The long and complex history of Eastern Avalonia's northern margin is analysed to identify the three tectonic events mentioned above.
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Egerquist, Eva. "Ordovician (Billingen and Volkhov stages) Brachiopod Faunas of the East Baltic." Doctoral thesis, Uppsala University, Palaeontology group, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4303.

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Lower-Middle Ordovician (Arenig) successions in the East Baltic have been investigated for more than one hundred and fifty years. Nevertheless detailed sampling still yields new species and better knowledge of the environment in which these organisms lived. The successions are well suited for bed by bed sampling because of the lack of tectonic disturbance and because the sequences are well documented.

This study analyses collections of Billingen-Volkhov age mainly from the St. Petersburg region, but also from Estonia. A great deal of the material was obtained from the marly to clayey, soft sediment that intercalates the compact packstones and wackestones in the succession. Twenty-nine of these clay horizons were used for diversity estimates on the fauna through the succession. The most thoroughly investigated groups for this investigation were rhynchonelliformean brachiopods, conodonts and ostracodes. The results indicate that variances in diversity and abundance levels for these groups were not correlated, either to each other or to the small-scale sea level fluctuations that have been suggested for the region. However, diversity dynamics of brachiopods and ostracodes confirm the large-scale upward shallowing of the basin into the Upper Volkhov. Comparison with fossils from the limestones did not reveal any differences in faunal composition between the two preservation modes.

The detailed sampling, coupled with sampling of the recently described mud mounds that occur in several outcrops, yielded large numbers of specimens. This enabled revision of earlier poorly known rhynchonelliformean genera such as Ujukella Andreev, as well as better known genera such as Porambonites Pander. In total the examined faunas include 31 genera assigned to 53 species of rhynchonelliformean brachiopods. Of these Leoniorthis and Eoporambonites are defined as new genera, and the following new species are described: Neumania paucicostata, Ranorthis rotunda, Orthidium gambolovensis, Orthidium lavensis, Skenidioides minutus, Tetralobula peregrina, Idiostrophia prima and Idiostrophia tenuicostata.

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Books on the topic "Early Ordovician"

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Repetski, John E. Discovery of early Ordovician fossils in Bucks County, Pennsylvania. [Washington: U.S. G.P.O., 1991.

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Jin, Jisuo. Late Ordovician-Early Silurian rhynchonellid brachiopods from Anticosti Island, Quebec. Villeurbanne, France: Université Claude Bernard, 1989.

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Ausich, William I. The Crinoidea of Anticosti Island, Québec (late Ordovician to early Silurian). Calgary: Canadian Society of Petroleum Geologists, 2010.

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Dewing, Keith. Late Ordovician and early Silurian strophomenid orachiopods of Anticosti Island, Québec, Canada. Calgary, Alta: Canadian Society of Petroleum Geologists, 1999.

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1940-, Copper Paul, Canadian Society of Petroleum Geologists., and Geological Association of Canada, eds. Late Ordovician and early Silurian pentamerid brachiopods from Anticosti Island, Québec, Canada. Calgary, Alta: Canadian Society of Petroleum Geologists, 2000.

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Williams, S. Henry. Early Ordovician (Arenig) graptolites of the Cow Head Group, western Newfoundland, Canada. Calgary, Alta: Canadian Society of Petroleum Geologists, 1988.

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Geological Survey (U.S.), ed. Paleomagnetism of a Late Cambrian or Early Ordovician dike from Lodore Canyon, northwestern Colorado. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Tapanila, Leif Michael. Bioerosion in late ordovician and early silurian tropical carbonate settings of Anticosti Island, Québec, Canada. Sudbury, Ont: Laurentian University, Department of Earth Sciences, 2001.

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Landing, Ed. Early and early Middle Ordovician continental slope deposition: shale cycles and sandstones in the New York Promontory and Quebec Reentrant region. Albany, N.Y: University of the State of New York, New York State Museum/Geological Survey, State Education Dept., 1992.

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Long, Darrel Graham Francis. The late Ordovician-Early Silurian carbonate tract of Anticosti Island, Gulf of St. Lawrence, eastern Canada. Waterloo: Geological Association of Canada/Mineralogical Association of Canada, 1994.

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Book chapters on the topic "Early Ordovician"

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Le Corre, C. "Early Tectonic Events (Ordovician)." In Pre-Mesozoic Geology in France and Related Areas, 179–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-84915-2_18.

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Maletz, Jörg, and Yuandong Zhang. "Early Ordovician Diversity Burst." In Graptolite Paleobiology, 153–80. Chichester, UK: John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781118515624.ch10.

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Douglas, A. G., J. S. Sinninghe Damsté, J. W. de Leeuw, T. I. Eglinton, and M. G. Fowler. "Distribution and Structure of Hydrocarbons and Heterocyclic Sulfur Compounds Released from Four Kerogens of Ordovician Age by Means of Flash Pyrolysis." In Early Organic Evolution, 267–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-76884-2_20.

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Fowler, Martin G. "The Influence of Gloeocapsomorpha prisca on the Organic Geochemistry of Oils and Organic-Rich Rocks of Late Ordovician Age from Canada." In Early Organic Evolution, 336–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-76884-2_26.

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Desrochers, André, and Noel P. James. "Early Paleozoic Surface and Subsurface Paleokarst: Middle Ordovician Carbonates, Mingan Islands, Québec." In Paleokarst, 183–210. New York, NY: Springer New York, 1988. http://dx.doi.org/10.1007/978-1-4612-3748-8_10.

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Bernini, F., G. Carnevale, G. Bagnoli, and S. Stouge. "An Early Ordovician oribatid mite (Acari: Oribatida) from the island of Öland, Sweden." In Acarid Phylogeny and Evolution: Adaptation in Mites and Ticks, 45–47. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-0611-7_6.

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Sánchez-García, T., M. Chichorro, A. R. Solá, J. J. Álvaro, A. Díez-Montes, F. Bellido, M. L. Ribeiro, et al. "The Cambrian-Early Ordovician Rift Stage in the Gondwanan Units of the Iberian Massif." In The Geology of Iberia: A Geodynamic Approach, 27–74. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-10519-8_2.

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Gutiérrez-Marco, J. C., J. M. Piçarra, C. A. Meireles, P. Cózar, D. C. García-Bellido, Z. Pereira, N. Vaz, et al. "Early Ordovician–Devonian Passive Margin Stage in the Gondwanan Units of the Iberian Massif." In The Geology of Iberia: A Geodynamic Approach, 75–98. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-10519-8_3.

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Cuffey, Roger J., Xiao Chuantao, Zhongde Zhu, Nils Spjeldnaes, and Zhao-Xun Hu. "The World’s Oldest-Known Bryozoan Reefs: Late Tremadocian, mid-Early Ordovician; Yichang, Central China." In Lecture Notes in Earth System Sciences, 13–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-16411-8_2.

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Perfilova, O. Yu, A. M. Sazonov, M. L. Makhlaev, and A. A. Vorontsov. "Igneous Rocks of the Kachinsk-Shumikhinsky Magmatic Area of Late Ordovician-Early Silurian Age (East Sayan)." In Geological Tour of Devonian and Ordovician Magmatism of Kuznetsk Alatau and Minusinsk Basin, 149–89. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-29559-2_7.

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Conference papers on the topic "Early Ordovician"

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Pope, Michael C. "Early Ordovician El Paso Formation and Late Ordovician Montoya Formation, Rhodes Canyon." In 53rd Annual Fall Field Conference. New Mexico Geological Society, 2002. http://dx.doi.org/10.56577/ffc-53.35.

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Quinton, Page C., James F. Miller, Raymond L. Ethington, and Kenneth G. MacLeod. "EARLY ORDOVICIAN CLIMATE FLUCTUATIONS INFERRED FROM CONODONT OXYGEN ISOTOPES." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-277262.

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Pohl, Alexandre, Yannick Donnadieu, Yannick Donnadieu, Guillaume Le Hir, Guillaume Le Hir, David Ferreira, and David Ferreira. "THE CLIMATIC SIGNIFICANCE OF LATE ORDOVICIAN–EARLY SILURIAN BLACK SHALES." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-336415.

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Whalen, Christopher D., and Derek E. G. Briggs. "AN EARLY ORDOVICIAN VERTEBRATE FROM THE FEZOUATA LAGERSTÄTTE OF MOROCCO." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-323032.

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Li, Yanfang, Tongwei Zhang, and Baojian Shen. "Environmental Changes during the Late Ordovician–early Silurian Linked to Volcanism." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1530.

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V. Taninskaya, N., V. G. Kots, and K. Viskunova. "Ordovician - Early Devonian Sequence Stratigraphy and Evolution of the Timan Pechora Basin." In 60th EAGE Conference and Exhibition. European Association of Geoscientists & Engineers, 1998. http://dx.doi.org/10.3997/2214-4609.201408530.

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Brothers, R. William, and David S. Jones. "EFFECTS OF EARLY DIAGENESIS ON δ44/40CA RECORDS OF UPPER ORDOVICIAN DOLOSTONES." In 51st Annual Northeastern GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016ne-272629.

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Huang, Chunju, Shenghui Deng, Shishuang Dong, Linda Hinnov, Rui Zhang, Zhixiang Wang, Yuanzheng Lu, and Xin Li. "ASTRONOMICALLY FORCED CYCLICITY IN THE LATE ORDOVICIAN-EARLY SILURIAN, SICHUAN BASIN, CHINA." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-283308.

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Lam, Adriane R., Sarah L. Sheffield, and Nicholas J. Matzke. "PALEOBIOGEOGRAPHY OF THE EARLY PALEOZOIC ECHINODERMS ACROSS THE GREAT ORDOVICIAN BIODIVERSIFICATION EVENT." In Joint 69th Annual Southeastern / 55th Annual Northeastern GSA Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020se-344679.

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Neumann, Mareike, and Christian Hallmann. "Tracing Early Terrestrialization in the Ordovician-Silurian Dirk Hartog Group, Southern Carnarvon Basin." In 29th International Meeting on Organic Geochemistry. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201902974.

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Reports on the topic "Early Ordovician"

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Cecile, M. P., B. S. Norford, G. S. Nowlan, and T. T. Uyeno. Lower Paleozoic stratigraphy and geology, Richardson Mountains, Yukon (with stratigraphic and paleontological appendices). Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329454.

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The Richardson Trough was a rift basin on the southern margin of an ancestral Iapetus Ocean. It was part of a complex paleogeography that included at least two major rift basins on western Franklinian and northern Cordilleran continental shelves. This paleogeography included the Ogilvie Arch, Porcupine Platform, Blackstone 'supra-basin', Babbage Basin, Husky Lakes Arch, Richardson Trough, Mackenzie Arch, Lac des Bois Platform, and the White Mountains and Campbell uplifts. The Richardson Trough was the failed arm of a triple rift system that formed when an early Paleozoic Iapetus Ocean developed north of the trough. The Richardson Trough displays a classic 'steer's head' profile with two rift fill cycles. The first features late early to middle late Cambrian rifting and late late Cambrian to late Early Ordovician post-rift subsidence; the second, late Early Ordovician to early Silurian rifting and late early Silurian to early Middle Devonian post-rift subsidence. Lower Paleozoic strata exposed in the Richardson Trough range in age from middle Cambrian to early Middle Devonian and are similar to strata in their sister rift, the Misty Creek Embayment. Before this study, the stratigraphic units defined for the Richardson Trough were the Slats Creek Formation and the Road River Formation. Here, the Slats Creek Formation and a new Road River Group are recognized. In order, this group consists of the middle and/or late Cambrian to Early Ordovician Cronin Formation; the early Early Ordovician to latest early Silurian Mount Hare Formation; the early Silurian to late Silurian Tetlit Formation; and the late Silurian to early Middle Devonian Vittrekwa Formation. These Road River Group strata are unconformably overlain by the late Middle to Late Devonian Canol Formation (outcrop) and by the Early Devonian Tatsieta Formation (subsurface).
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Riva, J. F. V. Late Middle-Early Late Ordovician graptolites from the base of the Amadjuak Formation, southern Baffin Island, Nunavut. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2000. http://dx.doi.org/10.4095/211849.

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Asselin, E., A. Achab, and A. Soufiane. Late Middle-Early Late Ordovician chitinozoans from the base of the Amadjuak Formation, southern Baffin Island, Nunavut. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2000. http://dx.doi.org/10.4095/211850.

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Foster, CB, DS Edwards, and I. Long. Reconnaissance study of Early Ordovician organic-walled microfossils from Barnicarndy 1, Barnicarndy Graben, Canning Basin, Western Australia. Geoscience Australia, 2021. http://dx.doi.org/10.11636/record.2021.040.

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Pope, M. C., and S. A. Leslie. New data from Late Ordovician-Early Silurian Mount Kindle Formation measured sections, Franklin Mountains and eastern Mackenzie Mountains, Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2013. http://dx.doi.org/10.4095/292389.

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Fallas, K. M., and W. Matthews. Age dating of a bentonite in the Duo Lake Formation, western Mackenzie Mountains, Northwest Territories. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328830.

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In the Misty Creek Embayment of the western Mackenzie Mountains, Duo Lake Formation locally includes minor volcanic deposits associated with Marmot Formation volcanism. A bentonite layer from an outcrop of graptolitic shale found in NTS map area 106-B, in the upper part of the Duo Lake Formation, was sampled for U-Pb zircon dating. Analytical results yielded a dominant population of grains with a concordia age of 439.8 ± 3.0 Ma, interpreted as the age of deposition. Minor inherited zircon populations yielded ages ranging from approximately 1200 to 2850 Ma. Observed graptolites from the same outcrop likely range from Middle Ordovician to Early Silurian and are compatible with the interpreted U-Pb age of the bentonite. Previously known Middle and Late Ordovician volcanic activity in the Misty Creek Embayment is here expanded to include Early Silurian activity, and serves as a proxy for the timing of active extensional tectonism in the basin.
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Mueller, C., S. J. Piercey, M. G. Babechuk, and D. Copeland. Stratigraphy and lithogeochemistry of rocks from the Nugget Pond Deposit area, Baie Verte Peninsula, Newfoundland. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328989.

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Stratigraphic and lithogeochemical data were collected from selected drill core from the Nugget Pond gold deposit in the Betts Cove area, Newfoundland. The stratigraphy consists of a lower unit of basaltic rocks that are massive to pillowed (Mount Misery Formation). This is overlain by sedimentary rocks of the Scrape Point Formation that consist of lower unit of turbiditic siltstone and hematitic cherts/iron formations (the Nugget Pond member); the unit locally has a volcaniclastic rich-unit at its base and grades upwards into finer grained volcaniclastic/turbiditic rocks. This is capped by basaltic rocks of the Scrape Point Formation that contain pillowed and massive mafic flows that are distinctively plagioclase porphyritic to glomeroporphyritic. The mafic rocks of the Mount Misery Formation have island arc tholeiitic affinities, whereas Scrape Point Formation mafic rocks have normal mid-ocean ridge (N-MORB) to backarc basin basalt (BABB) affinities. One sample of the latter formation has a calc-alkalic affinity. All of these geochemical features are consistent with results and conclusions from previous workers in the area. Clastic sedimentary rocks and Fe-rich sedimentary rocks of the Scrape Point Formation have features consistent with derivation from local, juvenile sources (i.e., intra-basinal mafic rocks). The Scrape Point Formation sedimentary rocks with the highest Fe/Al ratios, inferred to have greatest amount of hydrothermally derived Fe, have positive Ce anomalies on Post-Archean Australian Shale (PAAS)-normalized trace element plots. These features are consistent with having formed via hydrothermal venting into an anoxic/ sub-oxic water column. Further work is needed to test whether these redox features are a localized feature (i.e., restricted basin) or a widespread feature of the late Cambrian-early Ordovician Iapetus Ocean, as well as to delineate the role that these Fe-rich sedimentary rocks have played in the localization of gold mineralization within the Nugget Pond deposit.
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