Nichkesaisk Formation
Stratigraphic range: Early Campanian ~75 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Lithology
Primary	Claystone
Location
Coordinates	41°12′N 71°18′E / 41.2°N 71.3°E / 41.2; 71.3
Approximate paleocoordinates	34°54′N 64°42′E / 34.9°N 64.7°E / 34.9; 64.7
Region	Jalal-Abad
Country	Kyrgyzstan
Extent	Fergana Valley
Nichkesaisk Formation (Kyrgyzstan)

The Nichkesaisk or Nichkesai Formation is an early Campanian geologic formation in Kyrgyzstan.^[1] Fossil dinosaur eggs have been reported from the formation.^[2]

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with dinosaur trace fossils
    • Dinosaur eggs

• Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21

• L. A. Nessov. 1995. Dinozavri severnoi Yevrazii: Novye dannye o sostave kompleksov, ekologii i paleobiogeografii [Dinosaurs of northern Eurasia: new data about assemblages, ecology, and paleobiogeography]. Institute for Scientific Research on the Earth's Crust, St. Petersburg State University, St. Petersburg 1-156