| Castilletes Formation | |
|---|---|
| Stratigraphic range: Burdigalian-Langhian (Colloncuran-Friasian) ~ | |
| Type | Geological formation |
| Unit of | Cocinetas Basin |
| Underlies | Ware Formation |
| Overlies | Jimol Formation |
| Thickness | up to 440 m (1,440 ft) |
| Lithology | |
| Primary | Mudstone, siltstone |
| Other | Sandstone |
| Location | |
| Coordinates | 11°56′48.48″N 71°19′56″W / 11.9468000°N 71.33222°W |
| Approximate paleocoordinates | 11°12′N 68°36′W / 11.2°N 68.6°W |
| Region | La Guajira Caribbean region |
| Country |  Colombia |
| Type section | |
| Named for | Castilletes |
| Named by | Rollins |
| Location | Uribia |
| Year defined | 1965 |
| Coordinates | 11°56′48.48″N 71°19′56″W / 11.9468000°N 71.33222°W |
| Region | La Guajira |
| Country | Colombia |
  Type locality of the formation in La Guajira | |
The Castilletes Formation (Spanish: Formación Castilletes, N1c) is a fossiliferous geological formation of the Cocinetas Basin in the northernmost department of La Guajira, Colombia. The formation consists of fossiliferous mudstones, siltstones and medium-grained to conglomeratic fossiliferous lithic to quartzitic sandstones. The Castilletes Formation dates to the Neogene period; Burdigalian to Langhian stages, Colloncuran and Friasian in the SALMA classification, and has a maximum thickness of 440 metres (1,440 ft).