// Workers AI · dad joke modeWhat did the Telsitna Formation say? "Rock" solid information.

Telsitna Formation
Stratigraphic range: Middle to Late Ordovician
Type	Formation
Unit of	Nixon Fork terrane carbonate succession
Underlies	Younger Silurian carbonate and clastic units (locally unconformable)
Overlies	Novi Mountain Formation
Lithology
Primary	Limestone
Other	Dolomite, Siltstone
Location
Region	Kuskokwim Mountains, Alaska
Country	United States
Extent	West-central Alaska (Nixon Fork terrane)
Type section
Named for	Telsitna River region, Alaska
Named by	Dutro Jr. & Patton Jr. (1982)

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