Big Hill Formation | |
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Stratigraphic range: Late Ordovician | |
Type | Formation |
Unit of | Richmond Group (geology) |
Underlies | Manitoulin Dolomite |
Overlies | Stonington Formation |
Lithology | |
Primary | limestone |
Location | |
Region | Michigan |
Country | United States |
The Big Hill Formation is a geologic formation in Michigan. It preserves fossils dating back to the Ordovician period. A fossiliferous site on the Stonington Peninsula (in Delta County) includes a dolomite bed of the Big Hill Formation which has abundant and well-preserved fossils. The most common fossils are soft-bodied medusae (jellyfish), followed by linguloid brachiopods, algae, and arthropods (namely chasmataspidids, leperditid ostracods, and eurypterids). This site is considered a Konservat-Lagerstätte, and is commonly referred to as the Big Hill Lagerstätte or Big Hill Biota.[1][2]