| Tansill Formation | |
|---|---|
| Stratigraphic range: | |
 Yates (yellow sandstone) and Tansill (white limestone) | |
| Type | Formation |
| Unit of | Artesia Group |
| Overlies | Yates Formation |
| Thickness | 123–320 feet (37–98 m) |
| Lithology | |
| Primary | Limestone, siltstone, anhydrite |
| Location | |
| Coordinates | 32°26′53″N 104°15′54″W / 32.448°N 104.265°W |
| Region | New Mexico |
| Country | United States |
| Type section | |
| Named for | Tansill power dam |
| Named by | DeFord et al. |
| Year defined | 1938 |
  Tansill Formation (the United States)  Tansill Formation (New Mexico) | |
The Tansill Formation is a geologic formation in southeastern New Mexico and west Texas, United States.[1] It preserves fossils dating back to the late Guadalupian Age of the Permian period.[2]