Doughnut Formation

Doughnut Formation er en Upper Mississippian geologisk enhet i det vestlige USA. Diskefossiler er blitt oppdaget i shale outcrops av denne formasjon i Dinosaur National Monument.

Referanser

Litteratur 
 Hunt, ReBecca K., Vincent L. Santucci and Jason Kenworthy. 2006. «A preliminary inventory of fossil fish from National Park Service units.» in S.G. Lucas, J.A. Spielmann, P.M. Hester, J.P. Kenworthy, and V.L. Santucci (ed.s), Fossils from Federal Lands. New Mexico Museum of Natural History and Science Bulletin 34, pp. 63–69.

Colorado
Utah
Dinosaur National Monument
Rocky Mountains