Big Hill Formation

Big Hill Formation
Stratigraphic range: Late Ordovician
Jointed limestone from the Big Hill Formation (Upper Peninsula of Michigan)
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]

• List of fossiliferous stratigraphic units in Michigan

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.

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Chronostratigraphy of Michigan

Ph

Cz	Q Pleistocene indet. Glacial till
Mz	J indet. Ionia Formation
Pz	C ⁋ Grand River Formation Saginaw Formation indet. Parma Sandstone M Bayport Limestone Coldwater Shale Marshall Sandstone Sunbury Shale D Upper indet. Antrim Shale Bedford Shale Berea Sandstone Ellsworth Shale Frasnian Squaw Bay Limestone Middle Givetian Squaw Bay Limestone Alpena Limestone Amherstburg Formation Anderdon Limestone Bell Shale Bois Blanc Formation Dundee Limestone Ferron Point Formation Long Lake Limestone Lucas Formation Rockport Quarry Limestone Rogers City Limestone Sylvania Sandstone Thunder Bay Limestone Lower Garden Island Formation S indet. Bertie Formation Byron Formation Bush Bay Formation Cordell Formation Hendricks Formation Lime Island Formation Pointe aux Chenes Formation Put-in-Bay Dolomite Raisin River Dolomite Rapson Creek Formation Rockview Formation Salina Group Schoolcraft Formation St. Ignace Dolomite Llandovery Cabot Head Shale Manitoulin Dolomite O Upper Sandbian Bill's Creek Shale Big Hill Formation Stonington Formation Middle Darriwilian Bill's Creek Shale Black River Formation Collingwood Shale Trenton Formation Lower Au Train Formation Є Munising Formation

pЄ

♇	Copper Harbor Conglomerate Freda Sandstone Jacobsville Sandstone Nonesuch Shale

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