To the northeast they are composed mostly of Lower Pleistocene or older fanglomerate underlain by Cretaceous grandiorite.
2.
In a wash near some of the petroglyphs there is a fault scarp that exposes some fanglomerate which is a type of sedimentary rock which looks like concrete with large rocks intermixed.
3.
Finally, on top of everything else, is a relatively thin layer of fanglomerate ( alluvial fan deposits ) laid down during the late Pleistocene ( Bureau of Land Management 1992 : 31 ).
4.
The rocks making up this colour are the most recent colours appearing on the rocks, aging at 1 to 2 million years old, and is described as fanglomerate composed of rock with manganese belonging to Quaternary . As for the red, which is composed of claystones ( iron ) and other clays belonging to the upper Tertiary, its said to also be aged around 3 to 4 millions years.
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