Coalmont Formation
Geologic formation in Colorado, US
Coalmont Formation | |
---|---|
Stratigraphic range: Paleocene-Wasatchian ~60–50 Ma PreꞒ Ꞓ O S D C P T J K Pg N | |
![]() Coalmont Formation, Jackson County, Colorado | |
Type | Formation |
Underlies | North Park Formation |
Overlies | Cretaceous strata[1] |
Thickness | 9,000 feet (2,700 m)[1] |
Lithology | |
Primary | Sandstone |
Other | Clay, Shale, Coal |
Location | |
Coordinates | ![]() ![]() Coalmont Formation (the United States) Show map of the United States![]() ![]() Coalmont Formation (Colorado) Show map of Colorado |
The Coalmont Formation (Tmc) is a geologic formation that outcrops in the North Park intermountain basin in Colorado. It contains fossil plants and coal layers dating back to the Paleogene period.[3]
Fossil content
![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c3/USGS_North_Park_Basin_geologic_map.png/250px-USGS_North_Park_Basin_geologic_map.png)
The following fossils have been reported from the formation:[3]
Insects
Flora
- Allantodiopsis erosa[6]
- Ampelopsis acerifolia[6]
- Betula stevensoni[6]
- Carya antiquorum[6]
- Cercidiphyllum arcticum[6]
- Cissus marginata[6]
- Eucommia serrata[6]
- Fraxinus eocenica[6]
- Glyptostrobus nordenskioldi[6]
- Hydromystria expansa[6]
- Lastrea goldiana[6]
- Laurophyllum perseanum[6]
- Laurus socialis[6]
- Lygodium coloradense[6]
- Metasequoia occidentalis[6]
- Mimosites coloradensis[6]
- Nordenskioldia borealis[6]
- Persea brossiana[6]
- Platanus nobilis[6]
- P. raynoldsi[6]
- Prunus corrugis[6]
- Pterocarya hispida[6]
- Quercus greenlandica[6]
- Q. sullyi[6]
- ?Robinia wardi[6]
- Sassafras thermale[6]
- Sparganium antiquum[6]
Wasatchian correlations
See also
References
- ^ a b Hail, W.J. and Leopold, E.B., 1960. Paleocene and Eocene age of the Coalmont Formation, North Park, Colorado. Geological Survey Professional Paper, 400-B, pp.B260-B261.
- ^ a b Beekly, A.L., 1915. Geology and coal resources of North Park, Colorado. U.S. Geological Survey Bulletin, 596, 121 p
- ^ a b Coalmont Formation at Fossilworks.org
- ^ a b Cockerell, 1916
- ^ a b c d Cockerell, 1918
- ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa Brown, 1962
Bibliography
- Brown, R. W. 1962. Paleocene flora of the Rocky Mountains and Great Plains. United States Geological Survey Professional Paper 375. 1–119. .
- Cockerell, T. D. A. 1918. New species of North American fossil beetles, cockroaches, and tsetse flies. Proceedings of the United States National Museum 54. 301–311. .
- Cockerell, T. D. A. 1916. Some American fossil insects. Proceedings of the United States National Museum 51. 89–106. .