Pictured Cliffs Sandstone
This unit is composed of primarily marine sandstone interbedded with thin layers of shale and is similar in composition, fossil assemblages, and depositional environment to the Intermediate unit of the Cliff House Sandstone. This unit is the youngest unit in the park and overlies the Lewis Shale. The Pictured Cliffs Sandstone represents the final regression of the Western Interior Seaway from northwestern New Mexico.
Did You Know?
On January 21, 1941, after a year of record rains, Threatening Rock fell and crushed about 60 rooms at Pueblo Bonito that had been excavated by Neil Judd in the 1920s. More...