Middle and Upper Ordovician symmetrical univalved mollusks (Monoplacophora and Bellerophontina) of the Cincinnati arch region

Wahlmann, G. P.

Middle and Upper Ordovician symmetrical univalved mollusks (Monoplacophora and Bellerophontina) of the Cincinnati arch region G.P. Wahlmann. - Washington U.S. G.P.O. 1992. - vi, 213, [90] p. ill. 29 cm. - Geological Survey professional paper 1066-0 .

Includes bibliographical references.

89600358


Monoplacophora, Fossil--Middle West.
Paleontology--Middle west.
Paleontology--Ordovician.
Archaeogastropoda, Fossil--Middle West.

QE805 / .W35 1990

564

I 19.16:1066-0
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