by Raymond R. Anderson and Jean Cutler Prior “Peculiar,” “irregular,” and “uncommon,” are words used to describe one class of Iowa rocks — glacial boulders or “erratics.” Geologists define erratics as stones or boulders that have been carried from their place of origin by a glacier and then left stranded by melting ice on bedrock […]
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Fossils in Iowa
by Jean Cutler Prior Many people have their beginning interest in geology stimulated by finding fossils. Holding the shell of a sea-dwelling organism found in an Iowa rock, far from the nearest ocean, makes us think about the vast changes that have occurred over the Earth’s surface and the great length of geologic time that […]
