The geologic framework of southern Lake Michigan
Journal of Great Lakes Research
By: D. S. Foster and D. W. Folger
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Abstract
The bathymetry is controlled by the underlying bedrock. Bedrock comprises Silurian dolomite and Devonian limestone and shale. Quaternary sediment, 10 to 40 m thick, overlies bedrock. From Waukegan, Illinois, south to Indiana Harbor, the bottom is floored by till, sand, pebbles, and cobbvles. The lake floor is erosional or nondepositional where till or gravel-cobble pavement is exposed. In contrast, north of Waukegan and east of Indiana Harbor, fine sand covers much of the bottom and grades offshore to muddy sand. The complex surficial bottom sediment distribution between Waukegan and Michigan City, Indiana, could be mapped in detail only where sidescan sonar mosaics are available. Sand, important for protecting the substrate from erosion and for maintaining beaches, is not abundant throughout much of the area. -from Authors
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The geologic framework of southern Lake Michigan |
| Series title | Journal of Great Lakes Research |
| DOI | 10.1016/S0380-1330(94)71131-X |
| Volume | 20 |
| Issue | 1 |
| Year Published | 1994 |
| Language | English |
| Contributing office(s) | Woods Hole Coastal and Marine Science Center |
| Description | 17 p. |
| Larger Work Title | Journal of Great Lakes Research |
| First page | 44 |
| Last page | 60 |
| Country | United States |
| State | Illinois, Indiana, Michigan, Wisconsin |
| Google Analytic Metrics | Metrics page |