Excursion to Caesar Creek State Park in Warren County, Ohio: A Classic Upper Ordovician Fossil-Collecting Locality, Guidebook No. 12, by Douglas L. Shrake, 18 p., 11 figures, 1 table, 9 plates, 1992.

Guidebook No. 12 leads visitors through one of the world's most famous fossil beds found just outside Cincinnati, Ohio. Readers will get good use out of discussions of the geologic history of the area, as well as rules for collecting and detailed descriptions and plates of the various and abundant Ordovician fossils found in Caesar Creek State Park.