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ordovician
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The Ordovician trilobites of the Shelve Inlier, west Shropshire
The Ordovician trilobites of the Shelve Inlier, west Shropshire
By W. F. Whittard
Bibliographic index of American Ordovician and Silurian fossils ..
By Ray S. Bassler
A study of the James types of Ordovician and Silurian Bryozoa
A study of the James types of Ordovician and Silurian Bryozoa
By Ray S. Bassler
The Ordovician trilobite Hadrohybus Raymond 1925, and its family relationships (Postilla)
The Ordovician trilobite Hadrohybus Raymond 1925, and its family relationships (Postilla)
By Richard A. Fortey
The Ordovician system in most of Russian Asia
The Ordovician system in most of Russian Asia
By Reuben James Ross,John A. Talent
The great Ordovician biodiversification event
By Florentin Paris
Biostratigrafii︠a︡ i trilobity verkhnego kembrii︠a︡ i nizhnego ordovika severo-zapada Sibirskoĭ platformy
Biostratigrafii︠a︡ i trilobity verkhnego kembrii︠a︡ i nizhnego ordovika severo-zapada Sibirskoĭ platformy
By A. V. Rozova
Ostracoda of the upper Clays Ferry, Kope, and lower Fairview Formations (Middle and Upper Ordovician) at Moffett Road, northern Kentucky
Ostracoda of the upper Clays Ferry, Kope, and lower Fairview Formations (Middle and Upper Ordovician) at Moffett Road, northern Kentucky
By Jean Milton Berdan
A monograph of the Ordovician trilobites of the Bala area, Merioneth
By H. B. Whittington
Silicified Middle Ordovician trilobites
By H. B. Whittington
The Ordovician system in Canada
The Ordovician system in Canada
By Christopher R. Barnes
Ordovician and Silurian faunas from Arctic Canada
Ordovician and Silurian faunas from Arctic Canada
By Curt Teichert
On the primordial fauna and the Taconic system
By Joachim Barrande
Silicified Upper Ordovician--Lower Silurian ostracodes from the Avalanche Lake area, southwestern District of Mackenzie
Silicified Upper Ordovician--Lower Silurian ostracodes from the Avalanche Lake area, southwestern District of Mackenzie
By M. J. Copeland
Ordovician paleontology of the northern Hudson Bay lowland
By Samuel J. Nelson
Figures and Descriptions of Canadian Organic Remains
Figures and Descriptions of Canadian Organic Remains
By Geological Survey of Canada.
Silicified Middle Ordovician trilobites
By H. B. Whittington
The Taconic and Lower Silurian rocks of Vermont and Canada
The Taconic and Lower Silurian rocks of Vermont and Canada
By Marcou, Jules
Geology of the Cuba City, New Diggings, and Shullsburg Quadrangles, Wisconsin and Illinois
Geology of the Cuba City, New Diggings, and Shullsburg Quadrangles, Wisconsin and Illinois
By Thomas E. Mullens
Trilobites from the Survey Peak, Outram, and Skoki formations (Upper Cambrian-Lower Ordovician) at Wilcox Pass, Jasper National Park, Alberta
Trilobites from the Survey Peak, Outram, and Skoki formations (Upper Cambrian-Lower Ordovician) at Wilcox Pass, Jasper National Park, Alberta
By William Thornton Dean
Conodonts from Ordovician-Silurian boundary strata, Whittaker Formation, Mackenzie Mountains, Northwest Territories
Conodonts from Ordovician-Silurian boundary strata, Whittaker Formation, Mackenzie Mountains, Northwest Territories
By Godfrey S. Nowlan
The Lower and Middle Ordovician cephalopod faunas of England and Wales
The Lower and Middle Ordovician cephalopod faunas of England and Wales
By Evans, David H.
Revision of some Cambrian and Ordovician inarticulate brachiopods
Revision of some Cambrian and Ordovician inarticulate brachiopods
By A. J. Rowell