Articles from November 2021

IGS group photo

The Inside Story

Tuesday, November 30, 2021
The Iowa Geological Survey (IGS) has a long and illustrious history in the state, beginning in 1855, when legislation proposed by Governor James W. Grimes provided for a geological survey of the state, which was led by State Geologist James Hall. It was the start of great things for the state of Iowa, with its many geological resources. Iowa established a permanent geological survey as a separate agency of state government in 1892
Benton County shows the contrast between the Cedar and Iowa River valleys. The Cedar has numerous dunes (black lines) coming out of the valley while the Iowa largely lacks these features.

The Borderlands

Tuesday, November 16, 2021
Iowa’s landscape has been reshaped throughout geologic history, most recently due to the advancement of continental ice sheets. Since the ice retreated, the landscape has undergone fluvial incision and the glacial deposits have experienced weathering and soil development.