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BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Endicott Group
RTUpper Devonian
 Mississippian
 Alaska
 North Slope
 Kayak Shale
 Kekiktuk Conglomerate
SNN Alaska. Upper Devonian to Mississippian. Includes Kayak Shale and Kekiktuk Conglomerate. Indexed with ages as applicable. Added to Thesaurus in 1989.