Bedrock topography of northeast Iowa

IMAP 933



The bedrock in Iowa (Hershey, 1969) is generally overlain by deposits of glacial drift and alluvium, which range in thickness from less than 1 foot (0.3 m) to more than 400 ft (18 m), respectively. The configuration of the bedrock surface is the result of a complex system of ancient drainage courses when were developed during a long period of preglacial erosion and during shorter, but more intense, periods of interglacial erosion. 

Study Area

Publication type Report
Publication Subtype USGS Numbered Series
Title Bedrock topography of northeast Iowa
Series title IMAP
Series number 933
DOI 10.3133/i933
Year Published 1975
Language English
Publisher U.S. Geological Survey
Publisher location Iowa City, IA
Contributing office(s) Iowa Water Science Center
Description 2 plates: 27.49 x 47.04 inches and 30.91 x 47.01 inches
Country United States
State Iowa
Scale 25000
Online Only (Y/N) N
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
Additional publication details