Coalmont Formation Explained

Coalmont Formation
Type:	Formation
Age:	Paleocene-Wasatchian ~
Period:	Ypresian
Prilithology:	Sandstone
Otherlithology:	Clay, Shale, Coal
Namedfor:	Coalmont, Jackson County, Colorado^[1]
Namedby:	A. L. Beekly
Region:	Colorado
Coordinates:	40.4°N -106.5°W
Paleocoordinates:	45°N -90.3°W
Underlies:	North Park Formation
Overlies:	Cretaceous strata^[2]
Thickness:	9000feet
Extent:	North Park intermountain basin

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

• Calandrites hindsi^[4]
• ?Calandrites ursorum
• ?Carabites arapahoensis^[5]
• Curculio beeklyi^[5]
• Ophryastites hendersoni^{[4] [5]}

Flora

• Allantodiopsis erosa
• Ampelopsis acerifolia
• Betula stevensoni
• 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

Wasatchian correlations in North America

Formation																		Coalmont				Ypresian (IUCS) • Itaboraian (SALMA) Bumbanian (ALMA) • Mangaorapan (NZ)
Basin		Piceance	Colorado Plateau	Wind River	Green River																	align=center rowspan=14
Copelemur	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Coryphodon	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Diacodexis	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Homogalax	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Oxyaena	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Paramys	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Primates	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Birds	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Reptiles	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
Insects	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
	align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center		align=center
	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

• Coalmont, Colorado
• List of fossiliferous stratigraphic units in Colorado
• Paleontology in Colorado

References

Bibliography

Notes and References

1. Beekly, A.L., 1915. Geology and coal resources of North Park, Colorado. U.S. Geological Survey Bulletin, 596, 121 p
2. 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.
3. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayStrata&geological_group=&formation=Coalmont&group_formation_member=Coalmont Coalmont Formation
4. Cockerell, 1916
5. Cockerell, 1918
6. Brown, 1962