1. 1 DESERT LANDSCAPES HAVE CONCENTRATED ON SAND DUNES SO FAR NOW WILL LOOK AT THE REST OF THE DESERT WHAT IS LEFT AFTER THE SAND IS REMOVED?

2. 2 DESERT LANDSCAPES DESERT PAVEMENT –LAG GRAVELS –REG –GIBBER PLAIN (Australia) VENTIFACTS – WIND ERODED ROCKS YARDANGS – WIND ERODED ROCK STRUCTURES BLOWOUTS

3. 3 DESERT LANDSCAPES FLUVIAL PROCESSES –HAVE DISCUSSED RAINFALL INTENSE UNRELIABLE SCARCE –HAVE TALKED BRIEFLY ABOUT FLASH FLOODS –DRY STREAM BEDS = ARROYO, WADI, WASH

4. 4 DESERT LANDSCAPES DESERT VARNISH –THIN SHINY DARK COATING ON ROCKS AND OUTCROPS –MANGANESE –ORIGIN QUESTIONED DUST PLUS DEW MICRO-ORGANISMS

5. 5 DESERT LANDSCAPES DESERT SOILS –UNDER NEW SYSTEM CALLED ARIDISOLS LITTLE HUMUS CALICHE (CALCRETE) SALTS TEND TO BE HIGHLY ALKALINE –GIVEN WATER AND PROPER CARE CAN BE VERY FERTILE –PROBLEMS OF SALINIZATION AND WATERLOGGING

6. 6 DESERT LANDSCAPES TWO BASIC LANDSCAPES –FAULT BLOCK MOUNTAINS –PLATEAU TYPE USE THE WESTERN U.S. AS EXAMPLES OF EACH TYPE WILL LOOK AT SOME OTHER AREAS ALSO

7. 7 DESERT LANDSCAPES BASIN AND RANGE EXAMPLE –FAULT BLOCK MOUNTAINS HORSTS AND GRABENS –EROSION – SLOPE RETREAT –DEPOSITION ALLUVIAL FANS PLAYAS PLAYA LAKES

8. 8 DESERT LANDSCAPES BASIN AND RANGE EXAMPLE (CONT) –BAJADAS –PEDIMENTS –BOLSON –SABKHA (SEBKHA) -from the Arabic. Flat area covered with salts. Fed by ground water not surface runoff.

9. 9 DESERT LANDSCAPES COLORADO PLATEAU –GENERALLY FLAT LYING OR GENTLY DIPPING ROCK STRATA –CENTERED ON THE 4 CORNERS AREA –5000 FEET ABOVE SEA LEVEL –VULNERABLE TO EROSION BY RAINS WHEN THEY DO FALL

10. 10 DESERT LANDSCAPES COLORADO PLATEAU (CONT) –DIFFERENTIAL RESISTANCE TO EROSION RESISTANT ROCKS FROM PLATEAUS MESAS BUTTES –MONOCLINES HOGBACKS CUESTAS

11. 11 DESERT LANDSCAPES BADLANDS ROCKY DESERT POLAR DESERT OCEAN DESERTS (?)