| Coalmont Formation | |
|---|---|
| Stratigraphic range: Paleocene-Wasatchian ~60–50 Ma PreꞒ Ꞓ O S D C P T J K Pg N | |
.jpg) Coalmont Formation, Jackson County, Colorado | |
| Type | Formation |
| Underlies | North Park Formation |
| Overlies | Cretaceous strata |
| Thickness | 9,000 feet (2,700 m) |
| Lithology | |
| Primary | Sandstone |
| Other | Clay, Shale, Coal |
| Location | |
| Coordinates | 40°24′N 106°30′W / 40.4°N 106.5°W / 40.4; -106.5 |
| Approximate paleocoordinates | 45°00′N 90°18′W / 45.0°N 90.3°W / 45.0; -90.3 |
| Region | Colorado |
| Country |  United States |
| Extent | North Park intermountain basin |
| Type section | |
| Named for | Coalmont, Jackson County, Colorado |
| Named by | A. L. Beekly |
  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.
Fossil content
The following fossils have been reported from the formation:
Insects
- Calandrites hindsi
- ?Calandrites ursorum
- ?Carabites arapahoensis
- Curculio beeklyi
- Ophryastites hendersoni
Flora
- Allantodiopsis erosa
- Ampelopsis acerifolia
- Betula stevensoni
- Carya antiquorum
- Cercidiphyllum arcticum
- Cissus marginata
- Eucommia serrata
- Fraxinus eocenica
- Glyptostrobus nordenskioldi
- Hydromystria expansa
- Lastrea goldiana
- Laurophyllum perseanum
- Laurus socialis
- Lygodium coloradense
- Metasequoia occidentalis
- Mimosites coloradensis
- Nordenskioldia borealis
- Persea brossiana
- Platanus nobilis
- P. raynoldsi
- Prunus corrugis
- Pterocarya hispida
- Quercus greenlandica
- Q. sullyi
- ?Robinia wardi
- Sassafras thermale
- Sparganium antiquum
Wasatchian correlations
See also
References
- ^ 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.
- ^ Beekly, A.L., 1915. Geology and coal resources of North Park, Colorado. U.S. Geological Survey Bulletin, 596, 121 p
- ^ Coalmont Formation at Fossilworks.org
- ^ Cockerell, 1916
- ^ Cockerell, 1918
- ^ 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 (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