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).