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Grand River ledges outcrop

View on map:42.759824°N 84.759189°W

Comments

The exposures of the Pennsylvanian Saginaw Formation along the Grand River consists of nearly horizontal sedimentary deposits.  Ancient wind-blow sand dunes are documented by cross bedding in the upper units.  Swamp environments document a changing landscape defined by thick sandstone units with coal beds and shale interspersed.  

Description


Location of Grand Ledge, Michigan

Grand Ledge is a city in the U.S. state of Michigan. The city lies mostly within Eaton County, though a small portion extends into Clinton County, and sits above the Grand River 12.7 miles (20.4 kilometers) directly west of downtown Lansing. The population was 7,786 at the 2010 census. The city is well known for, and named for, its 300-million-year-old, sandstone and quartzite rock ledges that rise 60 feet (18 m) above the Grand River and are used by recreational rock climbers.

References

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