Borax solution at Kramer, California

Material of obscure structure that forms part of the hanging wall of the great sodium borate ore body at Kramer, Kern County, Calif., is interpreted herein as collapsed insoluble claystone layers left where interbedded borax has been dissolved. Nodular ulexite in such collapsed material is secondary; relationships between primary borax and contemporaneous ulexite or other syngenetic borate minerals remain unestablished. The effects of solution also leave unestablished the original limits of borax deposition. It is suggested that collapsed claystone layers containing ulexite might be used as an indicator of proximity to borax elsewhere in the district.