iron oxide cross bedded sandstone of canyon de chelly

aeolian american ancient apache archaeology arizone austere barren bedded bedrock blue canyon chelly cloudless colorful contrasts corners county cross deep delineate desert dunes economy epitome erosion four geologic geology grain guide hatched indian iron landscape lithification lithified local monument nation national native navajo nps ochre oxidation oxide park patterns peoples perch process red rocks rocky root rust sand sandstone scrubby service sharply sky slopes steep sweeping tourism trees umber unyielding uplift vibrant visit wedging west western