Williams Fork Formation

Williams Fork Formation
Stratigraphic range: Campanian (Edmontonian) ~73–70 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
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	United States
Williams Fork Formation (the United States) Show map of the United States Williams Fork Formation (Colorado) Show map of Colorado

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]