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Bedrock topography of west-central Iowa

IMAP 1688

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Abstract

Bedrock in Iowa (Hershey 1969) generally is overlain by deposits of glacial drift 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 to more than 70 feet. The configuration of the bedrock surface is the result of a long period of preglacial erosion and during shorter, but more intense, periods of interglacial erosion. This map, for a 12-county area in west-central Iowa, is the eighth of a series of nine reports that will provide statewide coverage of the bedrock topograhy of Iowa. 

Study Area

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Bedrock topography of west-central Iowa
Series title:
IMAP
Series number:
1688
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