Williams Fork Formation | |
---|---|
Stratigraphic range: Campanian (Edmontonian) ~73–70 Ma | |
Type | Geological formation |
Unit of | Mesaverde Group |
Lithology | |
Primary | Mudstone |
Other | Sandstone |
Location | |
Coordinates | 40°00′N 108°48′W / 40.0°N 108.8°W / 40.0; -108.8 |
Approximate paleocoordinates | 47°30′N 80°18′W / 47.5°N 80.3°W / 47.5; -80.3 |
Region | Colorado |
Country | ![]() |
The Williams Fork Formation is a Campanian to Maastrichtian (Edmontonian) geologic formation of the Mesaverde Group in Colorado. Dinosaur remains are among the fossils that have been recovered from the formation, most notably Pentaceratops sternbergii,[1]. Other fossils found in the formation are the ammonite Lewyites, tyrannosaurids, dromaeosaurids, troodontids, nodosaurids, ankylosaurids, hadrosaurids, hybodonts, neosuchian crocodylomorphs, and the mammals Glasbius and Meniscoessus collomensis.[2][3]