The Altan Uul locality was described by Michael Novacek as "a canyon carved out of a very rich series of sedimentary rocks" with "steep cliffs and narrow washes". The climate associated with it was wetter than when preceding formations were deposited; there seems to have existed at least some degree of forest cover.
Michael Novacek described the Altan Uul locality as a canyon formed by "rich sedimentary rocks" with "steep cliffs and narrow washes". The climate associated with it was wetter than when previous formations were deposited; there seems to have been at least some degree of forest cover.