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?
A thousand years ago, when Chaco was flourishing, you could hear the squawks of Scarlet ( Ara macao ) and Military ( Ara militaris ) macaws in the high desert. Live birds were traded along routes that stretched deep into present-day Mexico. They kept the live birds in rooms at Pueblo Bonito. More...