RUIN NEAR MOENKOPI.

RUINS OF PAYUPKI, SIX MILES NORTHWEST OF MASHONGNAVI, TUSAYAN.

MOUNTAINS AND PLATEAUS. 83

sedimentary rocks domed above them. Then the clouds gathered over these domes and wept, and their tears were gathered in brooks, and the brooks carved canyons down the sides of the domes; and now in these deep clefts the structure of the mountains is revealed. The lenses of volcanic rocks by which the domes were upheaved are known as "laccolites," i. e., rock lakes.

Looking southwestward from the Henry Mountains the Circle Cliffs are seen. A great escarpment, several thousand feet in height and 70 or 80 miles in length, faces the mountain. It is the step to the long, narrow plateau. The streams that come down across these cliffs head in great symmetric amphitheaters, and when first seen from above they present a vast alignment of walled circles. The front of the cliffs, seen from below, is everywhere imposing. On the southwest the Escalante River holds its course. It heads in the Aquarius Plateau and flows into the Colorado. Its course, as well as that of all its many tributaries, is in deep box-canyons of homogeneous red sandstone, often with vertical walls that are broken by many beautiful alcoves and glens. Much of the region is of naked, smooth, red rock, but the alcoves and glens that break the canyon walls are the sites of perennial springs, about which patches of luxuriant verdure gather.

The Kaiparowits Plateau is an elevated table-l