Name/Title
S31.03.013Description
Digging for trilobites at the Caesar Creek State Park emergency spillway in Warren County, Ohio. The image was made by Michael C. Hansen in summer 1986. Bedrock is from the Ordovician Geologic Period. Gregory A. Schumacher, Douglas L. Shrake and Thomas T. Johnson worked at the excavation site area shown here. Johnson had permission from the U.S. Army Corps of Engineers to conduct the excavation. All specimens found during the excavation were given to the Corps of Engineers for their Visitor Center at the Ceasar Creek site.
For more information, see: Isotelus--Ohio's State Fossil by Michael C. Hansen (Ohio Geological Survey, Ohio Geology Newsletter, Summer 1985).
And:
Large Isotelus Found by Michael C. Hansen (Ohio Geological Survey, Ohio Geology Newsletter, Spring 1989) page 6, which includes information about Thomas T. Johnson's trilobite collection.
This slide image included in the USGS National Digital Catalog for NGGDPP Grant G15AP00115 in FY2015.Context
Closeup of limestone rock; fossil linings in limestone rock. Taken at Caesar Creek State Park.