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Darriwilian to Katian (Ordovician) Graptolites from Northwest China

Xu, Cheng, author.
Amsterdam : Elsevier ; [Hangzhou, China] : Zhejiang University Press, [2017] 2017

Fossils in Ordovician tuffs, northeastern Maine

Neuman, Robert B., 1920- author.
Washington, D.C. : United States Department of the Interior, Geological Survey, 1964. 1964

The great Ordovician biodiversification event

New York ; Chichester, England : Columbia University Press, 2004. 2004

Late Ordovician articulate brachiopods from the Red River and Stony Mountain formations, southern Ma

Jin, Jisuo, 1957-
Ottawa : NRC Research Press, c2001. 2001

Lower Ordovician trilobites of the Kirtonryggen Formation, Spitsbergen

Fortey, Richard A.
Hoboken, New Jersey : Wiley Blackwell, 2013. 2013

Ordovician graptolites of the Basin Ranges in California, Nevada, Utah, and Idaho

Ross, Reuben James, 1918- author.
Washington, D.C. : United States Department of the Interior, Geological Survey, 1963. 1963

A sea without fish : life in the Ordovician sea of the Cincinnati region

Meyer, David L.
Bloomington : Indiana University Press, 2009. 2009

Teiichispira, a new early Ordovician gastropod genus

Yochelson, Ellis L. (Ellis Leon), 1928-2006, author.
Washington : United States Department of the Interior, Geological Survey, 1968. 1968