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Coalmont Formation
Stratigraphic range: Paleocene-Wasatchian
~60–50Ma
North Park Phacelia Habitat (5716435022).jpg
Coalmont Formation, Jackson County, Colorado
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 / 40.4; -106.5
Approximate paleocoordinates 45°00′N 90°18′W / 45.0°N 90.3°W / 45.0; -90.3
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

USGS North Park Basin geologic map
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:

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

Wasatchian correlations in North America
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)
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 Flag of Mexico.svg Mexico  United States
Copelemur Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg
Coryphodon Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg
Diacodexis Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg
Homogalax Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg
Oxyaena Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg
Paramys Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg Orange pog.svg
Primates Brown pog.svg Brown pog.svg Brown pog.svg Brown pog.svg Brown pog.svg Brown pog.svg Brown pog.svg
Birds White pog.svg White pog.svg White pog.svg White pog.svg White pog.svg
Reptiles SpringGreen pog.svg SpringGreen pog.svg SpringGreen pog.svg SpringGreen pog.svg SpringGreen pog.svg SpringGreen pog.svg SpringGreen pog.svg
Fish Blue pog.svg Blue pog.svg Blue pog.svg Blue pog.svg Blue pog.svg Blue pog.svg Blue pog.svg
Insects Steel pog.svg Steel pog.svg Steel pog.svg Steel pog.svg Steel pog.svg Steel pog.svg
Flora Green pog.svg Green pog.svg Green pog.svg Green pog.svg Green pog.svg Green pog.svg Green pog.svg Green pog.svg Green pog.svg
Environments Alluvial-fluvio-lacustrine Fluvial Fluvial Fluvio-lacustrine Fluvial Lacustrine Fluvio-lacustrine Deltaic-paludal Shallow marine Fluvial Shallow marine Fluvial Fluvial
Pink ff0080 pog.svg Wasatchian volcanoclastics

Orange pog.svg Wasatchian fauna

Dark Green 004040 pog.svg Wasatchian flora
Volcanic Yes No Yes No Yes No Yes No Yes No
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