Bedrock topography of northwest Iowa
IMAP
1726
By: R.E. Hansen and D. L. Runkle
Links
- More information: National Geologic Map Database Index Page (html)
- Plates:
- Superseded Publications:
- Download citation as: RIS | Dublin Core
Abstract
Bedrock in Iowa (Hershey, 1969) generally is overlain by deposits of glacial drive and alluvium. The drift, consisting of glacial till and glacial outwash, ranges in thickness from zero to more than 500 feet in western Iowa; the alluvium in stream valleys ranges in thickness from less than 1 foot to more than 70 feet. The configuration of the bedrock surface is the result of a complex system of ancient drainage courses that were developed during a long period of preglacial erosion. This map, for a 12 county area in west-central Iowa, is the eighth in a series of nine reports that will provide statewide coverage of the bedriock topography of Iowa.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Bedrock topography of northwest Iowa |
| Series title | IMAP |
| Series number | 1726 |
| DOI | 10.3133/i1726 |
| Year Published | 1986 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Iowa Water Science Center |
| Description | 2 Plates: 32.96 x 42.09 inches and 31.49 x 42.41 inches |
| Country | United States |
| State | Iowa |
| Scale | 25000 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |