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  • 1
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    Series available for loan
    Distribution of the Middle Ordovician Copenhagen Formation and its trilobites in Nevada (1972)
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
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    Call number: SR 90.0002(749)
    In: Professional paper
    Type of Medium: Series available for loan
    Pages: III, 33 S.
    Series Statement: U.S. Geological Survey professional paper 749
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
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    Ordovician Trilobites from the Romaine and Mingan Formations (Ibexian-Late Whiterockian), Mingan Islands, Quebec (2011)
    Paleontological Society
    Details
    Publication Date: 2011-05-01
    Description: The Romaine Formation of the Mingan Islands, Quebec, contains a limited trilobite fauna of five genera (Bolbocephalus, Peltabellia, Petigurus, Strigigenalis, Strotactinus) with Lower Ordovician Ibexian (Floian) affinity, succeeded by two genera (Acidiphorus, Pseudomera) of early Middle Ordovician Whiterockian (Dapingian) affinity. Trilobites of later Whiterockian (Darriwillian) affinity are more abundant in the overlying Mingan Formation, with 29 genera (Amphilichas, Bathyurus, Calyptaulax, Ceraurinella, Cybeloides, Dolichoharpes, Encrinuroides, Eobronteus, Eorobergia, Failleana, Glaphurina, Glaphurus, Hibbertia, Hyboaspis, Illaenus, Isotelus, Kawina, Nieskowskia, Phorocephala, Pandaspinapyga, Pliomerops, Remopleurides, Sphaerexochus [including S. valcourensis n. sp.], Sphaerocoryphe, Stenopareia, Thaleops, Thulincola, Uromystrum, and Vogdesia). Lectotypes are selected for Mingan species of Illaenus, Peltabellia, Petigurus, Sphaerexochus, Stenopareia, and Thaleops. A number of genera form biofacies which can be related to lithofacies. Taken together with Chazy Group and Northwest Territories trilobite faunas, Mingan trilobites provide critical information on late Whiterockian trilobite distributions in Laurentia in far more detail than seen in the stratotype area of Nevada.
    Print ISSN: 0022-3360
    Electronic ISSN: 1937-2337
    Topics: Geosciences
    Published by Paleontological Society
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  • 3
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    Ordovician trilobites from the Romaine and Mingan formations (Ibexian-late Whiterockian), Mingan Islands, Quebec (2011)
    Paleontological Society
    Details
    Publication Date: 2011-05-01
    Description: The Romaine Formation of the Mingan Islands, Québec, contains a limited trilobite fauna of five genera (Bolbocephalus, Peltabellia, Petigurus, Strigigenalis, Strotactinus) with Lower Ordovician Ibexian (Floian) affinity, succeeded by two genera (Acidiphorus, Pseudomera) of early Middle Ordovician Whiterockian (Dapingian) affinity. Trilobites of later Whiterockian (Darriwillian) affinity are more abundant in the overlying Mingan Formation, with 29 genera (Amphilichas, Bathyurus, Calyptaulax, Ceraurinella, Cybeloides, Dolichoharpes, Encrinuroides, Eobronteus, Eorobergia, Failleana, Glaphurina, Glaphurus, Hibbertia, Hyboaspis, Illaenus, Isotelus, Kawina, Nieskowskia, Phorocephala, Pandaspinapyga, Pliomerops, Remopleurides, Sphaerexochus [including S. valcourensis n. sp.], Sphaerocoryphe, Stenopareia, Thaleops, Thulincola, Uromystrum, and Vogdesia). Lectotypes are selected for Mingan species of Illaenus, Peltabellia, Petigurus, Sphaerexochus, Stenopareia, and Thaleops. A number of genera form biofacies which can be related to lithofacies. Taken together with Chazy Group and Northwest Territories trilobite faunas, Mingan trilobites provide critical information on late Whiterockian trilobite distributions in Laurentia in far more detail than seen in the stratotype area of Nevada.
    Print ISSN: 0022-3360
    Electronic ISSN: 1937-2337
    Topics: Geosciences
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  • 4
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    Viola Group (Ordovician, Oklahoma) cryptolithinid trilobites: biogeography and taxonomy (1991)
    Paleontological Society
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    Publication Date: 1991-11-01
    Description: Cryptolithinid trilobites have been repeatedly described from North America for over 150 years. Earlier work on these forms is here integrated with new information from Oklahoma to form a strong case for the following conclusions: 1) the genusCryptolithusmigrated to (present-day) eastern North America from Europe at a single time in the early Caradoc; 2) it gave rise rapidly to a western North American relative,Cryptolithoides; 3) both genera were restricted to relatively cool-water shelf environments roughly 30 m deep and remained, in general, geographically isolated for several million years. The Viola Group, geographically between these eastern and western occurrences and representing much of Middle and Upper Ordovician time, chronicles the interplay between these two genera over some six million years.In the biogeographic boundary region formed by Oklahoma, the two supposedly distinct genera showed suprising convergence of fringe pit and other character traits as marine transgression reduced provinciality through Ordovician time. This suprising convergence of genera is interpreted as hybridization of mere subspecies after several million years of incomplete geographic separation.
    Print ISSN: 0022-3360
    Electronic ISSN: 1937-2337
    Topics: Geosciences
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  • 5
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    Telephinaand Other Trilobites from the Pratt Ferry Beds, Ordovician of Alabama, U.S.A. (2014)
    Paleontological Society
    Details
    Publication Date: 2014-05-01
    Description: The Pratt Ferry beds are a three meter thick bioclastic carbonate unit containing thePygodus serrus–P. anserinusconodont zone boundary and lying just below theNemagraptus gracilisgraptolite zone at a single locality in Alabama.TelephinaMarek at Pratt Ferry and other eastern North American localities is represented by at least six species. These are judged widespread and in part conspecific with Scandinavian or Asian forms of similar age. Most of the fifteen Appalachian telephinid species proposed by Ulrich (1930) are reviewed and some synonymized.BevanopsisCooper is present, extending its stratigraphic range viaB. buttsi(Cooper). The original description ofCeraurinella buttsiCooper is augmented. Other recorded but poorly represented genera includeAmpyxina,Arthrorhachis,Calyptaulax,Hibbertia,Lonchodomas,Mesotaphraspis,Porterfieldia, andSphaerexochus. The entire faunule represents a mixture of ‘inshore’ and ‘offshore’ or planktonic faunal elements rarely seen elsewhere in the latest Middle Ordovician (Darriwilian) of eastern North America.
    Print ISSN: 0022-3360
    Electronic ISSN: 1937-2337
    Topics: Geosciences
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  • 6
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    North American biogeography and taxonomy of Cryptolithus (Trilobita, Ordovician) (1994)
    Paleontological Society
    Details
    Publication Date: 1994-07-01
    Description: Museum and field restudy of Cryptolithus from all known geographic and stratigraphic occurrences in eastern North America shows that the principal variable character in this genus is the number of fringe pit arcs. Because this character varies within populations and even single individuals, it cannot be used to distinguish the earlier, typologically defined species of the genus. Instead, a neotype is designated here for the type species, Cryptolithus tessellatus Green, 1832, and morph designations are used for all pit arc variants. Over the time span considered, the species increased the number of pit arcs, but the ecological and evolutionary mechanisms responsible cannot be identified with certainty.
    Print ISSN: 0022-3360
    Electronic ISSN: 1937-2337
    Topics: Geosciences
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  • 7
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    Ordovician Trinucleid Trilobites of the Prague Basin, Czech Republic (1995)
    Paleontological Society
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    Publication Date: 1995-05-01
    Description: Review of collections in Prague and at Harvard University, supplemented by additional field observations, has allowed taxonomic updating and revision of Barrandian trinucleid trilobites. Genera identified are Bergamia, Declivolithus, Nankinolithus, Tretaspis, Marrolithus, Deanaspis, and Onnia. One earlier described species is assigned to the new genus Marekolithus.Although partly isolated from the rest of north Gondwana during the Ordovician, the Prague Basin shares faunas with Sardinia and Morocco, as all show the transition from Deanaspis to Onnia. Spain, Britain, and the Baltic also share some species with Bohemia, particularly in the high Caradoc and Ashgill (Bohdalec and Králův Dvůr Formations).
    Print ISSN: 0022-3360
    Electronic ISSN: 1937-2337
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  • 8
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    Simpson Group (Middle Ordovician) Trilobites of Oklahoma (1974)
    Paleontological Society
    Details
    Publication Date: 1974-09-01
    Description: The Middle Ordovician Simpson Group of southern Oklahoma consists of an exceptionally continuous record of carbonates, shales and quartz sandstones which accumulated in a shallow shelf environment. Vertical changes in the distribution of trilobite genera from these rocks can reasonably be interpreted as due to age rather than the influence of various environments or faunal provinces. The affinities of the lower Simpson trilobite faunas are with inner shelf faunas of trilobite zones M and N known from Utah and eastern Nevada and, to a lesser degree, with early Middle Ordovician faunas of Quebec and Newfoundland. Middle Simpson (McLish and Tulip Creek) Formations reflect slightly higher energy conditions and very few well-preserved trilobites. Those few genera present (for example, Pliomerops and Eorobergia) are more typical of the Chazy Group and correlatives from eastern North America. The higher Bromide Formation, also of shelf origin, displays a distinctly eastern fauna, very similar to elements found in the Chazy Group and the presumably younger Edinburg Group of the east. Although many of Cooper's (1956) Middle Ordovician correlations can be understood, the stage names proposed at that time overlap in some cases and lack proper biostratigraphic definition in others. Abandonment of these stage names is urged until description of Middle Ordovician conodont, graptolite and shelly faunas now underway is nearer completion.
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    Electronic ISSN: 1937-2337
    Topics: Geosciences
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  • 9
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    Foraminifera, diatom and bivalve distribution in recent sediments of the Hudson Estuary (1978)
    Elsevier
    Details
    Publication Date: 1978-10-01
    Print ISSN: 0302-3524
    Electronic ISSN: 1878-3023
    Topics: Biology , Geography , Geosciences
    Published by Elsevier
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