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<br /> <br />'I -,.., .... I <br />, J ."t <br /> <br />southwestern Colorado, the Abajo Mountains in Utah, Navajo Mountain <br />along the boundary between Utah and Arizona, the Carrizo Mountains <br />in northeastern Arizona, and the Chuska Mountains in Arizona and <br />New Mexico. All of these mountains contain local areas of steep <br />ridges and narrow valleys and all contain peaks rising to above <br />g.OOO feet. <br /> <br />A plains topography interspersed with gently sloping ridges and <br />scattered badlands predominates over large areas in the southern <br />parts of the basin in much of the drainage basins of Chinle Wash <br />in Arizona. and the Chaco River in New Mexico. These areas are <br />underlain mainly by relatively soft sedimentary strata. Elevations <br />average between 5.000 and 6.000 feet. <br /> <br />'. - ,... <br /> <br />~- A~~t;~-.- <br />,~.~-~ :::":~- ... ~ ". ....... <br />.. <br /> <br /> <br />Sedimentary Deposits <br />near Four Corners <br /> <br />New Mexico <br /> <br />.. <br /> <br />In other parts of the basin. mainly the northern and eastern por- <br />tions. the presence of more resistant sedimentary rock layers has <br />resulted in a more rugged topography containing low mesas and <br />narrow canyons formed mostly in horizontal rock layers but in places. <br /> <br />II 1-5 <br /> <br />