rugged and colorful mountains along northshore road sr167 in lake mead national recreation area

167 area arizona arm blue boulder city colorado colorful desert drive dry environment erosion feature formation formations geological geology indigenous lake landscape lava layers limestone mead mohave mountain mountainous mountains nationa national nature nevada northshore outdoors overton panorama park peak recreation reserve ridge river road rock rocks rugged sandstone sates semi semidesert shale sky sr167 terrain territory trails united usa valley volcanic wilderness winds