Results 221 to 230 of about 68,053 (269)
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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.
H. B. Whittington, A. Williams
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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.
H. B. Whittington, A. Williams
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Geological Magazine, 1945
Notes that an Ordovician trilobite from Tourmakeady, Ireland, previously doubtfully assigned to the genus Cybelopsis may be confidently placed in Loganopeltis according to recent evidence.
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Notes that an Ordovician trilobite from Tourmakeady, Ireland, previously doubtfully assigned to the genus Cybelopsis may be confidently placed in Loganopeltis according to recent evidence.
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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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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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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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Biological Reviews, 1943
Summary Volborthella and Salterella of the Lower Cambrian arc probably pteropods, rather than cephalopods. The oldest undoubted cephalopods are two species of Plectronoceras from the Upper Cambrian of eastern Asia; both are small curved brevicones with ellipochoanitic siphuncles.
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Summary Volborthella and Salterella of the Lower Cambrian arc probably pteropods, rather than cephalopods. The oldest undoubted cephalopods are two species of Plectronoceras from the Upper Cambrian of eastern Asia; both are small curved brevicones with ellipochoanitic siphuncles.
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The Ordovician stromatoporoids
1979(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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Late Ordovician Mass Extinction: Earth, fire and ice
National Science Review, 2023David A T Harper
exaly