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ordovician geologic period

Ordovician paleontology of the northern Hudson Bay lowland

By Samuel J. Nelson

Silicified Middle Ordovician trilobites

By H. B. Whittington

Silicified Middle Ordovician trilobites

By H. B. Whittington

The Martinsburg Formation (middle and upper Ordovician) in the Delaware Valley, Pennsylvania-New Jersey

By Avery Ala Drake

Graptolites from the Lower Ordovician Pogonip Group of western Utah

By Lee F. Braithwaite

Morphologic and systematic relationships of some Middle Ordovician Ostracoda

By John Christian Kraft

Correlation of the Ordovician rocks in New York State

By Fisher, Donald W.

Beekmantown group

By William Jasper Sando

Chitinozoa from the Ordovician and Fernvale limestones of the Arbuckle Mountains, Oklahoma

By W. A. M. Jenkins

Early Ordovician (Arenig) stratigraphy and faunas of the Carmarthen district, south-west Wales

By Richard A. Fortey

Cambro-Ordovician studies

By J. R. Laurie

The Ordovician trilobite Pseudogygites Kobayashi in eastern and arctic North America

By Rolf Ludvigsen

Trilobites of the Ordovician Table Head formation, western Newfoundland

By H. B. Whittington

Figures and Descriptions on Canadian Organic Remains

By Geological Survey of Canada,John William Salter,James Hall ,Elkanah Billings ,Thomas Rupert Jones ,John Vaughan Thompson

Community paleoecology as a geologic tool

By Yu Wang

Appalachian Basin Ordovician Symposium

By Appalachian Basin Ordovician Symposium (1947 Pittsburgh)