The Yellowstone region's Beartooth Mountains feature some of the most ancient rocks in North America — as old as 3.96 billion ...

Beneath the crust of North America, scientists have found that the deep roots of the continent are slowly dripping away in ...

Nicknamed "St. Pauls Bay," the rock is made up of hundreds of densely ... And last year, Perseverance found light-colored sedimentary rocks with an uneven "popcorn-like" texture.

In the Danxia Shan national geopark tens of millions of years of erosion and tectonic activity have sculpted red sedimentary rock into dramatic peaks and valleys. The area is one of the Danxia ...