Beartooth Butte Formation
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| Beartooth Butte Formation | |
|---|---|
| Stratigraphic range: Lochkovian-Emsian ~ | |
| File:Cosmaspis transversa (Beartooth Butte Formation, Lower Devonian; Cottonwood Canyon, east of Lovell, Wyoming, USA) 4 (33446628334).jpg Fossil fish from the Beartooth Butte Formation | |
| Type | Formation |
| Sub-units | Cottonwood Canyon Member |
| Lithology | |
| Primary | Mudstone, sandstone |
| Other | Shale, limestone |
| Location | |
| Coordinates | Lua error in Module:Coordinates at line 489: attempt to index field 'wikibase' (a nil value). |
| Approximate paleocoordinates | Lua error: callParserFunction: function "#coordinates" was not found. |
| Region | Wyoming |
| Country | United States |
| Type section | |
| Named for | Beartooth Butte |
Beartooth Butte Formation (the United States) Beartooth Butte Formation (Wyoming) | |
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The Beartooth Butte Formation is a geologic formation in Wyoming. It preserves fossils dating back to the Devonian period.[1]
Description
[edit | edit source]The formation contains a basal limestone conglomerate overlain by evenly bedded red or gray limestones (more accurately, limy mudstones) and calcareous shales. It is a lenticular, channel-fill deposit which is some 2,500 feet (760 m) wide and 250 feet (76 m) thick at maximum. Most collections are from the talus slope. Stable oxygen and isotope data (Poulson in Fiorillo, 2000) indicate that the Beartooth Butte Formation was deposited in an estuarine environment, with the Cottonwood Canyon section being slightly less saline than the type section.
Fossil content
[edit | edit source]The following fossils have been reported from the formation:[1]
- Fish
- Allocryptaspis ellipticus
- A. flabelliformis
- Anarthraspis chamberlini
- A. montanus
- Bryantolepis brachycephalus
- B. cristatus
- Bryantolepis major
- B. obscurus
- Bulbocanthus rugosus
- Cardipeltis bryanti
- C. richardoni
- Cosmaspis transversa
- Lampraspis tuberculata
- Machaeracanthus minor
- Onchus penetrans
- O. peracutus
- Protaspis brevispina
- P. mcgrewi
- Uranolophus wyomingensis
- Aethaspis sp.
- Cephalaspis sp.
- Simblaspis sp.
- Arthropods
- Flora
- Invertebrates
See also
[edit | edit source]References
[edit | edit source]- ^ a b Beartooth Butte Formation at Fossilworks.org
Bibliography
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Categories:
- Geologic formations of Wyoming
- Devonian geology of Wyoming
- Emsian Stage
- Lochkovian Stage
- Pragian Stage
- Limestone formations of the United States
- Mudstone formations of the United States
- Sandstone formations of the United States
- Shale formations of the United States
- Shallow marine deposits
- Devonian southern paleotemperate deposits
- Devonian southern paleotropical deposits
- Paleontology in Wyoming