Hermosa Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Pennsylvanian
 .....Middle Pennsylvanian
 ......Hermosa Formation
RTNew Mexico
 Utah
 Colorado
 Arizona
 Honaker Trail Formation
 Paradox Member
SNMiddle Pennsylvanian of Arizona, Colorado, New Mexico and Utah. Added to Thesaurus in 1985.