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Geologic formation in Arkansas and Oklahoma, United States
The Bigfork Chert is a Middle to Late Ordovician geologic formation in the Ouachita Mountains of Arkansas and Oklahoma. First described in 1892, this
Bigfork_Chert
National park in Arkansas, United States
soft and argillaceous. The Bigfork Chert overlies the Womble Shale and consists almost entirely of chert and silty chert in layers 2 to 12 inches (51
Hot_Springs_National_Park
Mountain range in Arkansas and Oklahoma, United States
feet in length. The Ouachitas are also known for novaculite, a variety of chert that has undergone low-grade metamorphism; particular grades found only
Ouachita_Mountains
Second stage of the Upper Ordovician
Oklahoma (United States). It is an outcrop of the Womble Shale and the Bigfork Chert, the latter containing the lower boundary of the Katian. The lower boundary
Katian
Formation Unit of none Sub-units none Underlies Blaylock Sandstone Overlies Bigfork Chert Thickness 50 to 225 feet Lithology Primary Shale Location Region Arkansas
Polk_Creek_Shale
range: Ordovician Type Formation Unit of none Sub-units none Underlies Bigfork Chert Overlies Blakely Sandstone Thickness 500 to 1200 feet Lithology Primary
Womble_Shale
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