Muddy Creek Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Tertiary
 ....Muddy Creek Formation
RTPliocene
 Miocene
 Utah
 Nevada
 Arizona
SNMiocene or Pliocene. SE Nevada, NW Arizona and SW Utah. Indexed with ages as applicable. Added to Thesaurus in 1985.