Thunder Bay Limestone

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Thunder Bay Limestone
Stratigraphic range: Middle Devonian
Type Formation
Unit of Traverse Group
Sub-unitsPartidge Point Member, Potter Farm Member, and Norway Point Member
Underlies Kettle Point Formation and Squaw Bay Limestone
Overlies Alpena Limestone
Location
RegionFlag of Michigan.svg  Michigan
CountryFlag of the United States.svg  United States

The Thunder Bay Limestone is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.

Michigan U.S. state in the United States

Michigan is a state in the Great Lakes and Midwestern regions of the United States. The state's name, Michigan, originates from the Ojibwe word mishigamaa, meaning "large water" or "large lake". With a population of about 10 million, Michigan is the tenth most populous of the 50 United States, with the 11th most extensive total area, and is the largest state by total area east of the Mississippi River. Its capital is Lansing, and its largest city is Detroit. Metro Detroit is among the nation's most populous and largest metropolitan economies.

The Devonian is a geologic period and system of the Paleozoic, spanning 60 million years from the end of the Silurian, 419.2 million years ago (Mya), to the beginning of the Carboniferous, 358.9 Mya. It is named after Devon, England, where rocks from this period were first studied.

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References