Navajo section

The section is characterized by broad rolling plains on easily eroded and carved rocks, with cuestas (ridges) and tablelands capped by gently dipping resistant sandstone beds.

The highest point of the Navajo Section is 9,916 feet (3,022 m) at Chromo Mountain on the Continental Divide near Chama, New Mexico.

[2] Adjacent to the Navajo Section are the: The area is predominantly generally horizontal sandstone beds with some shale sequences of late Cretaceous and early Cenozoic age.

A few areas of the section also have abundant volcanic necks and buttes, but due to the arid weather and soft sandstone, many of the rock formations of the area have eroded to form distinctive features of long cuestas, shallow canyons and valleys, narrow fan terraces, undulating plateaus, isolated mesas, steep hills, and some shale badlands.

A stepped sequence of high stream terraces, present above the San Juan River and its tributaries, represents abandoned Pleistocene flood plains.