pofałdowany teren czerwonych skał parku erosion channels Waszyngton rugged slopes oświetlenie po południu rocky surfaces podnóża Colorado natural landforms sandstone textures wzory zbocza wzgórza elevated viewpoints suche plamy trawy Morrison przeoczyć ciepłe skały dźwięki geologia podgórna natural ridgelines Podgórza hrabstwa Jefferson amphitheatre approach path sandstone formation edge circular parking zone geological uplift area canyon access roads visitor complex area hogback terrain zone red roofed structures sandstone fin corridor roundabout lot area visitor circulation paths stage approach area facility walkway network parking access routes amphitheatre entry zone tilted sandstone layers foothill slope lines