Chainman Shale  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Mississippian
 .....Chainman Shale
RTUtah
 California
 Nevada
 Great Basin
SNGreat Basin region of E California, Nevada and W Utah. Added to Thesaurus in 1989.