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BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Jurassic
 ....Middle Jurassic
 .....Page Sandstone
RTUtah
 Wyoming
 Arizona
 San Rafael Group
SNIn San Rafael Group. Bajocian and Bathonian. Arizona, Utah, and Wyoming. Added to Thesaurus in 1995.