Geology and hydrology for environmental planning in Washtenaw County, Michigan

Open-File Report
Prepared in cooperation with the Michigan Department of Natural Resources



Washteaw County is underlain by glacial deposits that range in thickness from about 50 feet to about 450 feet. Underlying the glacial deposits are sedimentary rocks of Mississippian and Devonian age. The youngest of these rocks are the sandstones of the Marshall Formation in the western part of the county;  the oldest are the limestones of the Detroit River Group in the southeast corner.

Sand and gravel deposits in some places in the county may yield more than 500 gallons per minute of water. Approximately 50 percent of the wells tapping the Marshall Formation, the most reliable bedrock aquifer, can yield as much as 60 gallons per minute.

Washtenaw County has sand and gravel deposits that are more than 50 feet thick. The deposits are mined in several areas and are of economic importance. In addition, there may be potential for peat production in the western part of the county and for clay production in the eastern part.

Study Area

Publication type Report
Publication Subtype USGS Unnumbered Series
Title Geology and hydrology for environmental planning in Washtenaw County, Michigan
Series title Open-File Report
DOI 10.3133/70185555
Year Published 1980
Language English
Publisher U.S. Geological Survey
Publisher location Lansing, MI
Contributing office(s) Michigan Water Science Center
Description iv, 23 p.
Country United States
State Michigan
County Washtenaw County
Google Analytic Metrics Metrics page
Additional publication details