The world’s best record of terrestrial Cretaceous life, Merriam’s life zones, and Colorado River silt
I. Map boundaries: 33 to 40 degrees North; 110 to 114 degrees West
II. Country (State): United States (Arizona, Utah).
This map area includes the western Colorado Plateau, which is marked by dramatic escarpments along all its boundaries, leaving little doubt of its boundaries. To the south, it abruptly drops off at the Mogollon Rim in the Apache and Coconino NFs. To the west, there are the cliffs of the Grand Canyon and Grand Canyon Parashant National Monument. To the north, the Wasatch Plateaus drop off dramatically into the Great Basin. Continue reading