Results 211 to 220 of about 92,675 (274)
Middle Ordovician Stratigraphic and Faunal Study, southern Alberta and Southeast British Columbia
, 1963 B S Norford
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On the Ordovician Trilobite Provinces
Proceedings of the Japan Academy, 1976 openaire +3 more sources
Middle Ordovician Black River Ostracods from Michigan. Part IV. Species of Colacchilina (New Genus), Laccochilina, and Hesperidella [PDF]
, 1962 R. V. Kesling, Derek Hall, J. C. Melik
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Basin Research, 2020
The western North China Craton (W‐NCC) comprises the Alxa Terrane in the west and the Ordos Block in the east; they are separated by the Helanshan Tectonic Belt (HTB).
Jiaopeng Sun, Bo Hui
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The western North China Craton (W‐NCC) comprises the Alxa Terrane in the west and the Ordos Block in the east; they are separated by the Helanshan Tectonic Belt (HTB).
Jiaopeng Sun, Bo Hui
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Conodonts in Ordovician biostratigraphy
Lethaia, 2017The long time interval after Pander's (1856) original conodont study can in terms of Ordovician conodont biostratigraphical research be subdivided into three periods, namely the Pioneer Period (1856–1955), the Transition Period (1955–1971) and the Modern
S. M. Bergström, A. Ferretti
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Geological Society, London, Special Publications, 1964 Summary Stratigraphical and palaeontological evidence for the location of the boundaries of the Ordovician System is examined and considered to be less important than historical priority, so that the Tremadoc is excluded from the system.
A. Williams, H. B. Whittington
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An Ordovician Ceratiocaris [PDF]
American Midland Naturalist, 1945 In 1936 Bradford Willard and the late Professor Freeman Ward collected graptolites from a dump at the Hess slate quarry number 22, at Lynnport, Lehigh County, Pennsylvania (1). The material was submitted to Dr. Rudolf Ruedemann for identification. Dr. Ruedemann noted certain arthropods among the graptolites and kindly consented to study the specimens ...
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A giant Ordovician anomalocaridid
Nature, 2011Anomalocaridids, giant lightly sclerotized invertebrate predators, occur in a number of exceptionally preserved early and middle Cambrian (542-501 million years ago) biotas and have come to symbolize the unfamiliar morphologies displayed by stem organisms in faunas of the Burgess Shale type.
Derek E. G. Briggs +2 more
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1993
Abstract Most Ordovician and Silurian rocks in western and northwestern Canada were deposited on the North American craton and its western continental margin. Strata of these ages have also been recognized in three allochthonous terranes in the Cordillera, described in the companion volume on the Cordilleran Orogen (Gabrielse and Yorath,
M.P. Cecile, B.S. Norford
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Abstract Most Ordovician and Silurian rocks in western and northwestern Canada were deposited on the North American craton and its western continental margin. Strata of these ages have also been recognized in three allochthonous terranes in the Cordillera, described in the companion volume on the Cordilleran Orogen (Gabrielse and Yorath,
M.P. Cecile, B.S. Norford
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