| El Paso Formation | |
|---|---|
| Stratigraphic range: | |
 El Paso Formation in road cut near Lake Valley, New Mexico, USA | |
| Type | Formation |
| Sub-units | See text |
| Underlies | Portal Formation, Montoya Group |
| Overlies | Bliss Formation, Coronado Sandstone, Precambrian basement |
| Thickness | 137–300 meters (449–984 ft) |
| Lithology | |
| Primary | Limestone, dolomite |
| Other | Siltstone |
| Location | |
| Coordinates | 31°54′N 106°29′W / 31.90°N 106.49°W |
| Region | Texas, New Mexico, Arizona |
| Country | United States |
| Type section | |
| Named for | El Paso, Texas |
| Named by | G.B. Richardson |
| Year defined | 1904 |
  El Paso Formation (the United States)  El Paso Formation (New Mexico) | |
The El Paso Formation is a geologic formation that is exposed from the Permian Basin of New Mexico and Texas to southeastern Arizona. It preserves fossils dating back to the Ordovician period.[1][2][3]