in Figure 9 (adapted from Harrell and Brown 1992: Table 4)
Age Name Description
Quaternary Wadi Alluvium Sand with lithologically diverse pebbles and cobbles
of many colors but especially white, pink, brown, dark
gray and green.
Upper Nubia Sandstone. From a distance appears purplish-
Cretaceous Sandstone black due to a coating of ‘desert varnish’.
Late Fawakhir Granite and granodiorite with abundant iron-
Precambrian Granite stained, gold-bearing, hydrothermal quartz
veins. From a distance appears pink to pale red
due to natural coloring.
Hammamat A variety of slightly metamorphosed sedimentary
Siliciclastics rocks, including (meta) greywacke sandstone to
siltstone (the ancient Egyptian bekhen-stone),
conglomerate and shale. From a distance appears
dark brownish-gray due to a coating of ‘desert varnish’.
Dokhen A variety of slightly metamorphosed volcanic
Volcanics rocks, including (meta) rhyolite, andesite and basalt.
From a distance appears pinkish-brown due to
Atalla Serpentinite. From a distance appears pinkish-
Serpentinite brown due to weathering.