Blackwater Draw Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Quaternary
 ....Blackwater Draw Formation
RTPleistocene
 Holocene
 New Mexico
 Texas
SNPleistocene or Holocene. In Texas and New Mexico. Indexed with age as applicable. Added to Thesaurus in 1995.