iron oxide cross bedded sandstone of canyon de chelly

aeolian american ancient apache archaeology arizona austere bank bar barren bedded bedrock blue canyon channel cliff colorful contrasts corners county cross deep desert discoloration dunes dwellings economy epitome erosion four geologic geology grain guide hatched incised indian iron landscape lithification lithified local magnesium meander meandering monument nation national native navajo nps oxbow oxidation oxide park patina patterns perch process pueblo red river rocks root rust sand sandstone scrubby service slopes steep tourism umber unyielding uplift vibrant visit wedging west western