12 miles from the river, on top of the canyon NW of Bliss. I'm no geologist but they say it's basalt out there, miles of it. The thin soil between the rocks is a nasty gumbo when it's wet.
Basalt is a volcanic rock.
Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock, such as a lava flow, but can also form in small intrusive bodies, such as an igneous dike or a thin sill
https://geology.com/rocks/basalt.shtml#:~:text=Basalt%20is%20a%20dark%2Dcolored,a%20composition%20similar%20to%20gabbro.