Three Billion Years of Geologic History

Developing an integral understanding of Earth history is basic to a complete knowledge of Iowa geology.  Iowa’s rocks record a geologic history that goes back almost 3 billion years. Geologists at the Iowa Geological Survey strive to keep up to date with the latest advances in most aspects of Earth history.  They can answer questions on the age, depositional histories, climatic conditions, and other aspects of the formation of the geologic units in Iowa.  The stratigraphic column of Iowa lists all of the geologic units in Iowa by age.