Starting at GPS 37.13843N 112.56629W on route 89 in Southern Utah and driving south, I encountered massive crossbedded sandstone. The picture above is at the GPS point looking east (I waited for the truck for scale). The first two images are just south of this point on route 89. This is in Utah just 9 miles north of the Utah/Arizona border.
Below is an excerpt from the USGS report of an area 15 miles south of this spot. A lot of petrology books that I have read that introduce sedimentary rocks show the crossbedded Navajo Sandstone, so I recognized it as soon as I seen it.
Excerpt from USGS report on Mohave County, Arizona
SEDIMENTARY ROCKS Navajo Sandstone (Lower Jurassic)—White to light-red and yellow-gray, cliff-forming, medium-crossbedded to thickly-crossbedded, well-sorted, fine- to coarse-grained eolian quartz sandstone interbedded with dark-red, coarse-grained sandstone and siltstone in lower part. Age determination by Peterson and Pipiringos (1979) and Biek and others (2000). Lower part is commonly red, upper part commonly white. Includes lenses of interbedded dark purple-gray, thin-bedded, calcareous sandstone beds that formed freshwater deposits within and between coastal sand dunes. High-angle, crossbedded sandstone sets interbedded with low-angle, crossbedded sandstone and thin flat-bedded sandstone sets.
Excerpt from USGS report on Mohave County, Arizona
SEDIMENTARY ROCKS Navajo Sandstone (Lower Jurassic)—White to light-red and yellow-gray, cliff-forming, medium-crossbedded to thickly-crossbedded, well-sorted, fine- to coarse-grained eolian quartz sandstone interbedded with dark-red, coarse-grained sandstone and siltstone in lower part. Age determination by Peterson and Pipiringos (1979) and Biek and others (2000). Lower part is commonly red, upper part commonly white. Includes lenses of interbedded dark purple-gray, thin-bedded, calcareous sandstone beds that formed freshwater deposits within and between coastal sand dunes. High-angle, crossbedded sandstone sets interbedded with low-angle, crossbedded sandstone and thin flat-bedded sandstone sets.
