Nacimiento Formation Nacimiento Formation The Nacimiento Formation is a sedimentary rock formation found in the San Juan Basin of western New Mexico (United States) and named for the Nacimiento Mountains. It is a heterogeneous nonmarine formation composed of shale, siltstone, and sandstone, deposited in floodplain, fluvial and lacustrine settings, and made up of sediment shed from the San Juan uplift to the north and the Brazos-Sangre de Cristo uplift to the east. It was deposited mostly between ~64.5 and ~61 million years ago, during the early and middle Paleocene. The climate was humid and warm to hot. This unit interbeds with the
Flaming Cliffs refers to the red or orange color of the sandstone cliffs (especially at a sunset). The following are dinosaur fossils that have been found in the Flaming Cliffs. Theropods: Ornithischians Flaming Cliffs The Flaming Cliffs site, also known as Bayanzag, sometimes Bain-Dzak, ( "rich in saxaul"), with the alternative Mongolian name of ("red cliffs"), is a region of the Gobi Desert in the Ömnögovi Province of Mongolia, in which important fossil finds have been made. It was given this name by American paleontologist Roy Chapman Andrews, who visited in the 1920s. The area is most famous for yielding the first