Old Crow Tephra  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Quarternary
 ....Pleistocene
 .....Upper Pleistocene
 ......Old Crow Tephra
RTAlaska
 Yukon Territory
SNUpper Pleistocene. Alaska and Yukon Territory. Added to Thesaurus in 1993.