Bedrock topography of southwest Iowa

IMAP 1222
By:  and 



The bedrock in Iowa (Hershey, 1969) is generally overlain by unconsolidataed deposits consisting of glacial drift, alluvium, and loess. Loess deposits are most extensive in areas bordering the Missouri River flood plain, attaining a thickness of over 200ft in some places. The total thickness of the unconsolidated sediments ranges from less than 1 ft to more than 450 ft. The configuration of the underlying bedrock surface is the result of a complex system of ancient drainage courses that were developed during shorter, but more intense, periods of interglacial erosion. 

Study Area

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Bedrock topography of southwest Iowa
Series title IMAP
Series number 1222
ISBN 0607782579
DOI 10.3133/i1222
Year Published 1980
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Description 51.55 x 37.41 inches
Country United States
State Iowa
Scale 25000
Online Only (Y/N) N
Additional Online Files (Y/N) N