Pitkin Formation

Pitkin Formation Stratigraphic range: Carboniferous (Serpukhovian and Upper Visean)
Type	Formation
Sub-units	none
Underlies	Hale Formation
Overlies	Fayetteville Formation
Lithology
Primary	Limestone
Location
Region	Arkansas
Country	United States

The Pitkin Formation is a geologic formation in Arkansas. It preserves fossils dating back to the Carboniferous period.

Early work aimed at creating a comprehensive list for all fossils found in the Pitkin Formation was done by Easton in 1943. Unless otherwise stated, all species below can be found in his 'Fauna of the Pitkin Formation.'

This group was originally place under Stelleroidia in early studies.

Previous studies have grouped these diverse animals into a single, obsolete taxon: Vermes.

This group was also referred to by another name in earlier studies: Pelecypoda.

"Encrusting Algae" has been reported but not assigned to any genus.

Following is a list of fossils also found in the Pitkin by Easton in 1943 that have gone unidentified.

...
Wikipedia