The Telsitna Formation is a geologic formation in Alaska. It is part of the older rock record exposed in the Kuskokwim Mountains region, within the Nixon Fork terrane. The formation preserves evidence of an ancient shallow sea that once covered part of Alaska, recording a stage in the early Paleozoic development of the Laurentian northern margin.
The formation consists mainly of carbonate rocks, such as limestone and related sediments that formed in a shallow tropical to subtropical sea. It sits above older Ordovician stratigraphic units and is overlain by younger Paleozoic features, reflecting a long history of changing sea levels and environments in the region.
See also List of fossiliferous stratigraphic units in Alaska Paleontology in Alaska
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