RAGBRAI Learn about the Land; Day 3, July 2008

(2008) RAGBRAI Learn about the Land; Day 3, July 2008. Natural Resources, Department of


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Although during much of its geologic history Iowa was part of an interior sea, today what we see on the land surface has been heavily influenced by recent glaciation. Everything from Iowa soils, rivers, lakes, and hills has been influenced by glaciation. Most of Iowa’s bedrock is hidden beneath a thick mantle of deposits from the Cenozoic (i.e., new life) Era, spanning the last 65 million years. Geologists have divided the Cenozoic Era into two periods. These are the Tertiary (1.8-65 million years ago) and Quaternary Periods (recent to 1.8 million years ago). Most geologic records in Iowa are from the Quaternary period, and include glacial till and loess.

Item Type: Departmental Report
Keywords: RAGBRAI, DNR, Landscape
Subjects: State government > State agencies
Recreation and tourism
Land use, development, and construction > Land use planning
ID Code: 6466
Deposited By: Margaret Barr
Deposited On: 29 Jul 2008 18:46
Last Modified: 29 Jul 2008 18:46
URI: https://publications.iowa.gov/id/eprint/6466