Earth:Coalmont Formation
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| Coalmont Formation Stratigraphic range: Paleocene-Wasatchian ~60–50 Ma | |
|---|---|
.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 |
| 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] |
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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
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
| Basin | Powder River Uinta Piceance Colorado Plateau Wind River Green River Bighorn |
Piceance |
Colorado Plateau |
Wind River |
Green River |
Bighorn |
Williston | Okanagan | Princeton | Buck Creek | Nechako | Sverdrup | Potomac | GoM | Laguna Salada | Rio Grande | North Park | Raton | Galisteo | San Juan |      Coalmont Formation (North America) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Country |  United States |
 Canada |
United States |
 Mexico |
United States
| |||||||||||||||||
| Copelemur | 14px | 14px | 14px | 14px | ||||||||||||||||||
| Coryphodon | 14px | 14px | 14px | 14px | 14px | 14px | 14px | 14px | 14px | 14px | ||||||||||||
| Diacodexis | 14px | 14px | 14px | 14px | 14px | 14px | 14px | |||||||||||||||
| Homogalax | 14px | 14px | 14px | 14px | 14px | 14px | 14px | |||||||||||||||
| Oxyaena | 14px | 14px | 14px | 14px | 14px | |||||||||||||||||
| Paramys | 14px | 14px | 14px | 14px | 14px | 14px | 14px | 14px | 14px | |||||||||||||
| Primates | 10px | 10px | 10px | 10px | 10px | 10px | 10px | |||||||||||||||
| Birds | 10px | 10px | 10px | 10px | 10px | |||||||||||||||||
| Reptiles | 10px | 10px | 10px | 10px | 10px | 10px | 10px | |||||||||||||||
| Fish | 10px | 10px | 10px | 10px | 10px | 10px | 10px | |||||||||||||||
| Insects | 10px | 10px | 10px | 10px | 10px | 10px | ||||||||||||||||
| Flora | 10px | 10px | 10px | 10px | 10px | 10px | 10px | 10px | 10px | |||||||||||||
| Environments | Alluvial-fluvio-lacustrine | Fluvial | Fluvial | Fluvio-lacustrine | Fluvial | Lacustrine | Fluvio-lacustrine | Deltaic-paludal | Shallow marine | Fluvial | Shallow marine | Fluvial | Fluvial | 8px Wasatchian volcanoclastics 8px Wasatchian fauna 8px Wasatchian flora
| ||||||||
| Volcanic | Yes | No | Yes | No | Yes | No | Yes | No | Yes | No | ||||||||||||
See also
- Coalmont, Colorado
- List of fossiliferous stratigraphic units in Colorado
- Paleontology in Colorado
References
- ↑ 1.0 1.1 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.
- ↑ 2.0 2.1 Beekly, A.L., 1915. Geology and coal resources of North Park, Colorado. U.S. Geological Survey Bulletin, 596, 121 p
- ↑ 3.0 3.1 Coalmont Formation at Fossilworks.org
- ↑ 4.0 4.1 Cockerell, 1916
- ↑ 5.0 5.1 5.2 5.3 Cockerell, 1918
- ↑ 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 6.10 6.11 6.12 6.13 6.14 6.15 6.16 6.17 6.18 6.19 6.20 6.21 6.22 6.23 6.24 6.25 6.26 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, https://www.biodiversitylibrary.org/part/52652
- 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, https://www.biodiversitylibrary.org/part/1661
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