Coalmont Formation facts for kids
Quick facts for kids Coalmont FormationStratigraphic range: Paleocene-Wasatchian ~60–50Ma |
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Coalmont Formation, Jackson County, Colorado
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| 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 |
| Approximate paleocoordinates | 45°00′N 90°18′W / 45.0°N 90.3°W |
| Region | Colorado |
| Country |  United States |
| Extent | North Park intermountaine basin |
| Type section | |
| Named for | Coalmont, Jackson County, Colorado |
| Named by | A. L. Beekly |
The Coalmont Formation (Tmc) is a geologic formation that outcrops in the North Park intermountaine 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
| Formation | Wasatch | DeBeque | Claron | Indian Meadows | Pass Peak | Tatman | Willwood | Golden Valley | Coldwater | Allenby | Kamloops | Ootsa Lake | Margaret | Nanjemoy | Hatchetigbee | Tetas de Cabra | Hannold Hill | Coalmont | Cuchara | Galisteo | San Jose | Ypresian (IUCS) • Itaboraian (SALMA) Bumbanian (ALMA) • Mangaorapan (NZ) |
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| 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 | ||
| Country | United States |
 Canada |
United States |
 Mexico |
United States |
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| Coryphodon | |
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| Diacodexis | |
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| Homogalax | |
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| Environments | Alluvial-fluvio-lacustrine | Fluvial | Fluvial | Fluvio-lacustrine | Fluvial | Lacustrine | Fluvio-lacustrine | Deltaic-paludal | Shallow marine | Fluvial | Shallow marine | Fluvial | Fluvial |
 Wasatchian volcanoclastics Wasatchian fauna Wasatchian flora |
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| Volcanic | Yes | No | Yes | No | Yes | No | Yes | No | Yes | No | ||||||||||||
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Coalmont Formation Facts for Kids. Kiddle Encyclopedia.