FOSSILS tell us what life was like on earth in ancient geologic time. A fossil clam, for example, lived on a sea bottom much as its modern relatives do. By finding many fossil clams, we can determine the extent of a prehistoric sea. Fossils also indicate the climates of the geologic past. Fossils show us that life on earth has not always been the same. In fact primitive algae and bacteria have given rise to reptiles, mammals, and finally to man. Fossils aid geologists in finding oil and other mineral deposits.
Hogberg, R.K.; Sloan, R.E.; Tufford, Sarah.
Educational Series 1. Guide to Fossil Collecting in Minnesota_Revised.
Minnesota Geological Survey.
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