Pitkin Formation
| Pitkin Formation Stratigraphic range: Carboniferous (Serpukhovian and Upper Visean)[1] | |
|---|---|
| Type | Formation |
| Sub-units | none |
| Underlies | Hale Formation |
| Overlies | Fayetteville Formation |
| Lithology | |
| Primary | Limestone[1] |
| Location | |
| Region | Arkansas |
| Country | United States |
The Pitkin Formation is a geologic formation in Arkansas. It preserves fossils dating back to the Carboniferous period.[2]
Paleofauna
Early work aimed at creating a comprehensive list for all fossils found in the Pitkin Formation was done by Easton in 1943.[1] Unless otherwise stated, all species below can be found in his 'Fauna of the Pitkin Formation.'
Formanifera
- Endothyra
Porifera, Sponges
Scyphozoa
- Conularia Originally considered to be a gstropod.
Anthozoa, Corals
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Blastoidea
- P. laminatus
- P. platybasis
Crinoidea, Sea Lilies
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Ophiuroidea, Brittle Stars
This group was originally place under Stelleroidia in early studies.[1]
- Aganaster
- A. singulatus
- Schoenaster
Echinoidea, Sea Urchins
Worms
Previous studies have grouped these diverse animals into a single, obsolete taxon: Vermes.[1]
Bryozoa, "Moss-animals"
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Brachiopoda
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Bivalvia, Bivalves
This group was also referred to by another name in earlier studies: Pelecypoda.[1]
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Scaphopoda, Tusk Shells
- Laevidentalium
Gastropoda, Snails
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Cephalopoda
- Coloceras (see unidentified section)
- Cravenoceras
- C. hesperium
- C. randolphensis
- C. equoyahensis
- Dolorthoceras (See unidentified section)
- D. eurekensis
- Eoasianites
- E. globosus
- Mooreoceras
Trilobita
- Grifithides
- G. pustulosus
- Kaskia
- K. chesterensis
- Paladin
- P. mucronatus
Ostracoda
- Glyptopleurain
- G. optina
- Paraparchites
- Primitia
- P. fayettevillensis
Vertebrata
Plantae, Plants
"Encrusting Algae" has been reported but not assigned to any genus.[1]
Unidentified
Following is a list of fossils also found in the Pitkin by Easton in 1943 that have gone unidentified.[1]
- A "Cup Coral"
- A member of the genus Pentremites
- Three species within Agassizocrinus
- Two species within Scytalocrinus
- A totally unidentifiable Crinoid
- Two species of Bellerophon
- Two species of Gosseletina
- Two species of Leptoptygma
- Two Species of Strobeus
- One species each of Composita and Echinoconchus
- Two species of Cypricardella
- Two species of Coloceras, one of which may actually be Leuroceras
- One species of Dolorthoceras
- An unnamed shark spine
See also
References
- 1 2 3 4 5 6 7 8 9 Easton, William H., The Fauna of the Pitkin Formation of Arkansas., Journal of Paleontology: vol. 17:2. March, 1943.
- ↑ Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to thefix Paleobiology Database". Retrieved 8 July 2014.
- 1 2 3 4 Webb, Gregory., 1987., The Coral Fauna of the Pitkin Formation (Chesterian), Northeastern Oklahoma and Northwestern Arkansas. Journal of Paleontology vol. 61:3
- 1 2 Webb., Gregory., 1990., A New Tabulate Coral Species from the Pitkin Formation (Chesterian) of north-central Arkansas. Journal of Paleontology vol. 64:4.
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