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]
| Coalmont Formation | |
|---|---|
| Stratigraphic range: Paleocene-Wasatchian ~ | |
.jpg) 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 | 40°24′N 106°30′W / 40.4°N 106.5°W |
| Approximate paleocoordinates | 45°00′N 90°18′W / 45.0°N 90.3°W |
| Region | Colorado |
| Country |  United States |
| Extent | North Park intermountain basin |
| Type section | |
| Named for | Coalmont, Jackson County, Colorado[2] |
| Named by | A. L. Beekly[2] |
  Coalmont Formation (the United States)  Coalmont Formation (Colorado) | |
Fossil content
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The following fossils have been reported from the formation:[3]
Insects
editFlora
edit- 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
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See also
editReferences
edit- ^ 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
edit- 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 (2237): 301–311, doi:10.5479/si.00963801.54-2237.301
- Cockerell, T. D. A (1916), "Some American fossil insects", Proceedings of the United States National Museum, 51 (2146): 89–106, doi:10.5479/si.00963801.51-2146.89