Checkerboard Mesa, a good example of crossbedding (horizontal lines) and vertical cracks caused by thermal expansion/contraction. Navajo sandstone forms the cliffs and walls of Zion National Park. The sandstone reaches a thickness of 2300 feet and consists of ancient cemented desert sand dunes. Horizontal lines, commonly called crossbedding, represent layers of wind-blown sand that built up into sand dunes. These dunes were then buried, and the sand grains glued together by calcite and iron oxide to form sandstone.
Location: Zion National Park, Utah
Image ID: 12526