Elevations are 3600 to 4200 feet. The climate is hot and arid. These are the tentative Annroma , Diamondhil and Irongold series. Annroma soils lack an argillic horizon, have a mesic temperature regime and carbonatic mineralogy. Diamondhil soils have a mesic temperature regime and a duripan.
Irongold soils lack argillic horizon and have carbonatic mineralogy.
The present vegetation is mainly blackbrush, spiny menodora, big galleta and Indian ricegrass. These soils are not extensive. The name is coined from the town of Blue Diamond, NV which is near by.