| Yakataga Formation | |
|---|---|
| Stratigraphic range: Neogene | |
 Yakataga Formation on Middleton Island, Gulf of Alaska | |
| Type | Formation |
| Location | |
| Region | Alaska |
| Country | United States |
The Yakataga Formation is a geologic formation in Alaska. It preserves fossils dating back to the Neogene period.
The Staniukovich Formation is a geologic formation in Alaska. It preserves fossils dating back to the Cretaceous period.
The Okpikruak Formation is a geologic formation in Alaska. It preserves fossils dating back to the Cretaceous period.
The Chignik Formation is a geologic formation in Alaska. It preserves fossils dating back to the Cretaceous period.
The Kukpowruk Formation is a geologic formation in Alaska. It preserves fossils dating back to the Cretaceous period.
The McCann Hill Chert is a geologic formation in Alaska. It preserves fossils dating back to the Devonian period.
The Skajit Formation is a geologic formation in Alaska. It preserves fossils dating back to the Devonian period.
The Bowser Formation is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period.
The Kialagvik Formation is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period.
The Tyonek Formation is a geologic formation in Alaska. It preserves fossils dating back to the Neogene period.
The Bear Lake Formation is a geologic formation in Alaska. It preserves fossils dating back to the Neogene period.
The Stepovak Formation is a geologic formation in Alaska. It preserves fossils dating back to the Paleogene period.
The Poul Creek Formation is a geologic formation in Alaska. It preserves fossils dating back to the Paleogene period.
The Eagle Creek Formation is a geologic formation in Alaska. It preserves fossils dating back to the Permian period.
The Halleck Formation is a geologic formation in Alaska. It preserves fossils dating back to the Permian period.
The Takhandit Formation is a geologic formation in Alaska. It preserves fossils dating back to the Permian period.
The Road River Formation is a geologic formation in Alaska. It preserves fossils dating back to the Silurian period.
The Nehenta Formation is a geologic formation in Alaska. It preserves fossils dating back to the Triassic period.
The Chitistone Formation is a geologic formation in Alaska. It preserves fossils dating back to the Triassic period.
The Otuk Formation is a geologic formation in Alaska. It preserves fossils dating back to the Triassic period.
Arktocara is an extinct genus of river dolphin from the Oligocene epoch of Alaska, containing one species, A. yakataga. Having been discovered in 25-million-year-old strata near the 60th parallel north, it is perhaps the oldest-known crown toothed whale and the northmost river dolphin discovered. It was a member of the now-extinct family Allodelphinidae, along with the genera Allodelphis, Goedertius, Ninjadelphis, and Zarhinocetus. It measured approximately 2.26 or 2.28 meters, comparable to its closest living relative, the South Asian river dolphin, which measures 2.4 meters (7.9 ft). However, the animal probably had an elongated beak and neck, so it may have been longer. The animal is known only from a partially preserved skull. Its ecology may have been similar to the modern-day Dall's porpoise, and it may have competed with contemporaneous delphinoids. Its remains were found in the Poul Creek Formation, which has also yielded several mollusk species.
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