Coalmont Formation
Stratigraphic range: Paleocene-Wasatchian
~
Coalmont Formation, Jackson County, Colorado
TypeFormation
UnderliesNorth Park Formation
OverliesCretaceous strata[1]
Thickness9,000 feet (2,700 m)[1]
Lithology
PrimarySandstone
OtherClay, Shale, Coal
Location
Coordinates40°24′N 106°30′W / 40.4°N 106.5°W / 40.4; -106.5
Approximate paleocoordinates45°00′N 90°18′W / 45.0°N 90.3°W / 45.0; -90.3
RegionColorado
Country United States
ExtentNorth Park intermountain basin
Type section
Named forCoalmont, Jackson County, Colorado[2]
Named byA. L. Beekly[2]
Coalmont Formation is located in the United States
Coalmont Formation
Coalmont Formation (the United States)
Coalmont Formation is located in Colorado
Coalmont Formation
Coalmont Formation (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.[3]

Fossil content

Geologic map of the North Park Basin with the Coalmont Formation indicated in light green (Tmc)

The following fossils have been reported from the formation:[3]

Insects

Flora

Wasatchian correlations

Wasatchian correlations in North America
FormationWasatchDeBequeClaronIndian MeadowsPass PeakTatmanWillwoodGolden ValleyColdwaterAllenbyKamloopsOotsa LakeMargaretNanjemoyHatchetigbeeTetas de CabraHannold HillCoalmontCucharaGalisteoSan JoseYpresian (IUCS) • Itaboraian (SALMA)
Bumbanian (ALMA) • Mangaorapan (NZ)
BasinPowder River
Uinta
Piceance
Colorado Plateau
Wind River
Green River
Bighorn
Piceance




Colorado Plateau





Wind River





Green River






Bighorn
WillistonOkanaganPrincetonBuck CreekNechakoSverdrupPotomacGoMLaguna SaladaRio GrandeNorth ParkRatonGalisteoSan Juan
Coalmont Formation is located in North America
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation
Coalmont Formation (North America)
Country United States Canada United States Mexico United States
Copelemur
Coryphodon
Diacodexis
Homogalax
Oxyaena
Paramys
Primates
Birds
Reptiles
Fish
Insects
Flora
EnvironmentsAlluvial-fluvio-lacustrineFluvialFluvialFluvio-lacustrineFluvialLacustrineFluvio-lacustrineDeltaic-paludalShallow marineFluvialShallow marineFluvialFluvial
Wasatchian volcanoclastics

Wasatchian fauna

Wasatchian flora
VolcanicYesNoYesNoYesNoYesNoYesNo

See also

References

  1. 1 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.
  2. 1 2 Beekly, A.L., 1915. Geology and coal resources of North Park, Colorado. U.S. Geological Survey Bulletin, 596, 121 p
  3. 1 2 Coalmont Formation at Fossilworks.org
  4. 1 2 Cockerell, 1916
  5. 1 2 3 4 Cockerell, 1918
  6. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 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. 301–311. .
  • Cockerell, T. D. A. 1916. Some American fossil insects. Proceedings of the United States National Museum 51. 89–106. .
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