Chilcatay Formation
The Chilcatay Formation is a geologic formation located in Peru. The formation was deposited in the Pisco Basin, during the Early Miocene, roughly from 19.2 to 18.0 Ma. Fossil remains of baleen whales, sharks, and rays have been found in the formation.
Paleobiota of the Chilcatay Formation
Mammals
Dolphins
| Taxa | Species | Material | Description | Images | Notes |
| Huaridelphis | H. raimondii | A squalodelphinid river dolphin | |||
| Ensidelphis | E. riveroi | A river dolphin | |||
| Furcacetus | F. flexirostrum | A river dolphin | |||
| Incacetus | I. broggii | A kentriodontid dolphin | |||
| cf. Kentriodon | cf. K. sp. | A kentriodontid dolphin | |||
| Macrosqualodelphis | M. ukupachai | A squalodelphinid river dolphin | |||
| Notocetus | N. vanbenedeni | A squalodelphinid river dolphin | |||
| Squalodelphinidae | Gen. et. sp. indet. | A river dolphin |
Whales
| Taxa | Species | Material | Description | Images | Notes |
| Amphidelphis | A. bakersfieldensis | A cranium | |||
| Cetotheriidae | Gen. et. sp. indet. | ||||
| Chaeomysticeti | Gen. et. sp. indet. | A partial skull | A baleen whale; either a late-diverging stem mysticete or an early-branching crown mysticete | ||
| Chaeomysticeti | Gen. et. sp. indet. | A badly damaged dentary | A baleen whale; crownward of Eomysticetidae | ||
| Chaeomysticeti | Gen. et. sp. indet. | A skull | A crown-group baleen whale, possibly a basal plicogulan | ||
| Chilcacetus | C. cavirhinus | A toothed whale | |||
| Chilcacetus | C. ullujayensis | A toothed whale | |||
| Diaphorocetus | D. otergai | A physeteroid sperm whale | |||
| Eurhinodelphinidae | Gen. et. sp. indet. | A toothed whale | - | ||
| Inticetus | I. vertizi | A toothed whale | |||
| Mysticeti | Gen. et. sp. indet. | A baleen whale | |||
| Odontoceti | Gen. et. sp. indet. | A toothed whale | |||
| Rhaphicetus | R. valenciae | A physeteroid sperm whale |
Birds
Penguins
| Taxa | Species | Material | Description | Images | Notes |
| Palaeospheniscus | P. sp. | An early penguin |
Reptiles
Turtles
| Taxa | Species | Material | Description | Images | Notes |
| Testudines | Gen. et. sp. indet. | A turtle |
Crocodilians
| Taxa | Species | Material | Description | Images | Notes |
| Sacacosuchus | S. cordovai | A gavialid crocodilian |
Cartilaginous fish
Rays
| Taxa | Species | Material | Description | Images | Notes |
| cf. Anoxypristis | cf. A. sp. | A rostral spine | A sawfish | ||
| Dasyatidae | Gen. et. sp. indet. | Dermal denticles | A whiptail stingray | ||
| Myliobatoidea | Gen. et. sp. indet. | Teeth | A stingray; several of the teeth compare favorably with Myliobatis eagle rays |