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
A modern Cliona from the coastal waters of northern France.
Scyphozoa
- Conularia Originally considered to be a gstropod.
Anthozoa, Corals
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Aulopora from the Silica Formation of Ohio.
Pleurodictyum americanum from the Givetian Kashong Shale (Hamilton Group) of Livingston County, New York.
Syringopora from the Boone Formation of Arkansas.
Blastoidea
Pentremites godoni from the Lower Carboniferous of Illinois.
- P. laminatus
- P. platybasis
Crinoidea, Sea Lilies
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Cyathocrinus goniodactylus, on display at Galerie de paléontologie et d'anatomie comparée in Paris.
Fossil of Scytalocrinus from Carboniferous of the United States
Ophiuroidea, Brittle Stars
This group was originally place under Stelleroidia in early studies.[1]
- Aganaster
- A. singulatus
- Schoenaster
Echinoidea, Sea Urchins
An upper Carboniferous species of Archaeocidaris.
Worms
Previous studies have grouped these diverse animals into a single, obsolete taxon: Vermes.[1]
Bryozoa, "Moss-animals"
| Stereo image | ||
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| Fossilized skeleton of Archimedes Bryozoan. |
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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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