| La Puerta Formation | |
| Type: | Geological formation |
| Period: | Tithonian |
| Age: | Late Jurassic-Early Cretaceous ~ |
| Prilithology: | Sandstone |
| Region: | Chuquisaca Department |
| Coordinates: | -19.5°N -64.8°W |
| Paleocoordinates: | -19.6°N -31°W |
The La Puerta Formation is a Late Jurassic to Early Cretaceous geologic formation of southern Bolivia. The fluvial and eolian sandstones preserve ichnofossils of Theropoda indet., Thyreophora indet., Ankylosauria indet. and Stegosauria indet. at the Tunasniyoj tracksite.[1] The formation is possibly a distal extension of the Botucatu Formation.[2] The Tunasniyoj assemblage is the oldest dinosaur tracksite for Bolivia, and includes the oldest known evidence assigned to ankylosaurs and stegosaurs for South America.[3]