Three Forks Shale

Last updated
Three Forks Shale
Stratigraphic range: Devonian
Type Formation
Location
Region Montana
Country United States

The Three Forks Shale is a geologic formation in Montana and North Dakota. It preserves fossils dating back to the Devonian period. [1]

Montana U.S. state in the United States

Montana is a state in the Northwestern United States. Montana has several nicknames, although none are official, including "Big Sky Country" and "The Treasure State", and slogans that include "Land of the Shining Mountains" and more recently "The Last Best Place".

North Dakota U.S. state in the United States

North Dakota is a U.S. state in the midwestern and northern regions of the United States. It is the nineteenth largest in area, the fourth smallest by population, and the fourth most sparsely populated of the 50 states. North Dakota was admitted to the Union on November 2, 1889, along with its neighboring state, South Dakota. Its capital is Bismarck, and its largest city is Fargo.

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.

See also

Paleontology in Montana

Paleontology in Montana refers to paleontological research occurring within or conducted by people from the U.S. state of Montana. The fossil record in Montana stretches all the way back to the Precambrian. During the Late Precambrian, western Montana was covered by a warm, shallow sea where local bacteria formed stromatolites and bottom-dwelling marine life left tracks on the sediment that would later fossilize. This sea remained in place during the early Paleozoic, although withdrew during the Silurian and Early Devonian, leaving a gap in the local rock record until its return. This sea was home to creatures including brachiopods, conodonts, crinoids, fish, and trilobites. During the Carboniferous the state was home to an unusual cartilaginous fish fauna. Later in the Paleozoic the sea began to withdraw, but with a brief return during the Permian.

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Dinwoody Formation

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References

  1. Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014.