Dinosaurs graze the lush delta lands of North America 76-74 million years ago. - Ilustración de stock

Dinosaurs graze the lush delta lands near the North American inner sea from about 76-74 million years ago. This area is now modern Utah and Arizona and part of the larger Grand Staircase formation. Cycads, ferns, treeferns, conifers and calamites would make up part of the flora. Large Parana pines can be seen in the distance. They became extinct in North America by the end of the Cretaceous, but still exist today in South America. Dinosaurs visible in this image are Nasutoceratops in the front middle and Parasaurolophus cyrtocristatus in the far middle. The small Pachycephalosaur Stegoceras can be seen moving among the large ferns in the close foreground and across the lake moving along the shore can be seen a possible species of Albertosaurus.