Coalmont Formation
Appearance
Coalmont Formation | |
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Stratigraphic range: Paleocene-Wasatchian ~ | |
![]() 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 | ![]() |
Extent | North Park intermountain basin |
Type section | |
Named for | Coalmont, Jackson County, Colorado[2] |
Named by | A. L. Beekly[2] |
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
[edit]![](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
[edit]Flora
[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
[edit]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 | ||
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Copelemur | ![]() |
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Coryphodon | ![]() |
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Diacodexis | ![]() |
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Homogalax | ![]() |
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Oxyaena | ![]() |
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Paramys | ![]() |
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Primates | ![]() |
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Birds | ![]() |
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Fish | ![]() |
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Insects | ![]() |
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Flora | ![]() |
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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 | |||||||||
Volcanic | Yes | No | Yes | No | Yes | No | Yes | No | Yes | No |
See also
[edit]References
[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