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Data sets Publications Expeditions Thesaurus
Ivishak Formation  search
RTAlaska
 Lower Triassic
 North Slope
 Permian
 Permian-Triassic boundary
 Prudhoe Bay Field
 Sadlerochit Group
SNIn Sadlerochit Group. Permian to Lower Triassic. N Alaska. Indexed with ages as applicable. Added to Thesaurus in 1989.