White Bluff Formation

Geologic formation in Arkansas

White Bluff Formation

Stratigraphic range: Paleogene
Type| Formation
Unit of| Jackson Group
Sub-units| Pastoria Sand Member, Caney Point Marl Member, Rison Clay Member
Lithology
Primary| marl, sand, clay
Location
Region|  Arkansas
Country|  United States
Type section
Named for| White Bluff, along the Arkansas River

The White Bluff Formation is a marl, sand, and clay geologic formation in Arkansas that is part of the Jackson Group. It preserves fossils dating back to the Paleogene period, specifically the Eocene.

## Description

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The White Bluff Formation is composed of three members: the Pastoria Sand Member, the Caney Point Marl Member, and the Rison Clay Member.[1] The Pastoria Sand is a clayey sand containing glauconite and mollusca fossils. The Caney Point Marl is a chalky clay with glauconite and various invertebrate fossils. The Rison Clay is a clay with interbedded silts containing foraminifera fossils and scattered mollusca molds.[1] The entire formation was deposited as a marine sequence.[1][2]

## See also

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* Earth sciences portal
* United States portal
* Paleontology portal

* List of fossiliferous stratigraphic units in Arkansas
* Paleontology in Arkansas

## References

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1. ^ a b c Wilbert, Jr., Louis J. (1953). "The Jacksonian Stage in southeastern Arkansas" (PDF). Arkansas Division of Geology Bulletin. 19: 37–56. Archived (PDF) from the original on 25 January 2017. Retrieved 29 June 2018.
2. ^ McFarland, John D. (2004). "Stratigraphic summary of Arkansas" (PDF). Arkansas Geological Commission Information Circular. 36 (Revised ed.). Archived (PDF) from the original on 24 December 2016. Retrieved 29 June 2018.

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

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