Ingersoll Shale
Late Cretaceous geological unit in Alabama, United States
Ingersoll Shale | |
---|---|
Stratigraphic range: Santonian ~86–85 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ | |
Type | Informal unit |
Unit of | Eutaw Formation |
Thickness | 90 cm (35 in) |
Lithology | |
Primary | Claystone |
Other | Sandstone |
Location | |
Coordinates | ![]() ![]() Ingersoll Shale (the United States) Show map of the United States![]() ![]() Ingersoll Shale (Alabama) Show map of Alabama |
The Ingersoll Shale is a Late Cretaceous (Santonian) informal geological unit in eastern Alabama. Fourteen theropod feathers assigned to birds and possibly dromaeosaurids have been recovered from the unit.[1][2]
Description
The Ingersoll Shale consists of a clay-dominated lens, asymmetrical in cross-section, with a maximum thickness of 90 centimetres (35 in) and a width estimated to be less than 30 metres (98 ft).
References
- ^ Knight et al., 2011
- ^ Ingersoll Shale at Fossilworks.org
Bibliography
- Knight, Terrell K.; Bingham, P. Sean; Lewis, Ronald D.; Savrda, Charles E. (2011), "Feathers of the Ingersoll shale, Eutaw Formation (Upper Cretaceous), eastern Alabama: The largest collection of feathers from North American Mesozoic rocks" (PDF), PALAIOS, 26 (6): 364–376, Bibcode:2011Palai..26..364K, doi:10.2110/palo.2010.p10-091r