Coccolith fossil 40 million years old
Caption on back: Prof. Harold W. Scott (standing) and Prof. William W. Hay of University of Illinois department of geology examine enlarged photo of the fossil of a coccolith, a creature which lived 40 million years ago and was so tiny 1,000 would fit on a pinhead. Such fossils are important in identifying rock formations which may lead to fields of oil or gas or deposits of salt or gymsum.
Found in RS 39/2/20, Box COL 6-5 - COL 6-40, Folder COL 6-11 LAS Geology, 1910-90
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