# Coalmont Formation

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.

## 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

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 | Bighorn | Williston | Okanagan | Princeton | Buck Creek | Nechako | Sverdrup | Potomac | GoM | Laguna Salada | Rio Grande | North Park | Raton | Galisteo | San Juan | Coalmont Formation (North America) |
| Country | United States | United States | United States | United States | United States | United States | United States | United States | Canada | Canada | Canada | Canada | Canada | United States | United States | Mexico | United States | United States | United States | United States | United States | | Coalmont Formation (North America) |
| Copelemur | | | | | | | | | | | | | | | | | | | | | | Coalmont Formation (North America) |
| Coryphodon | | | | | | | | | | | | | | | | | | | | | | Coalmont Formation (North America) |
| Diacodexis | | | | | | | | | | | | | | | | | | | | | | Coalmont Formation (North America) |
| Homogalax | | | | | | | | | | | | | | | | | | | | | | Coalmont Formation (North America) |
| Oxyaena | | | | | | | | | | | | | | | | | | | | | | Coalmont Formation (North America) |
| Paramys | | | | | | | | | | | | | | | | | | | | | | Coalmont Formation (North America) |
| Primates | | | | | | | | | | | | | | | | | | | | | | Coalmont Formation (North America) |
| Birds | | | | | | | | | | | | | | | | | | | | | | Coalmont Formation (North America) |
| Reptiles | | | | | | | | | | | | | | | | | | | | | | Coalmont Formation (North America) |
| Fish | | | | | | | | | | | | | | | | | | | | | | Coalmont Formation (North America) |
| Insects | | | | | | | | | | | | | | | | | | | | | | Coalmont Formation (North America) |
| Flora | | | | | | | | | | | | | | | | | | | | | | Coalmont Formation (North America) |
| Environments | Alluvial-fluvio-lacustrine | Fluvial | | | | Fluvial | Fluvio-lacustrine | Fluvial | Lacustrine | Lacustrine | Fluvio-lacustrine | Fluvio-lacustrine | Deltaic-paludal | Shallow marine | Shallow marine | Fluvial | Shallow marine | Fluvial | | Fluvial | Fluvial | Wasatchian volcanoclastics Wasatchian fauna Wasatchian flora |
| Volcanic | Yes | No | No | No | No | No | No | No | Yes | No | Yes | No | Yes | No | No | No | No | No | No | Yes | No | Wasatchian volcanoclastics Wasatchian fauna Wasatchian flora |