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Thesaurus

Lower Permian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Permian
	....Lower Permian
NT	Abo Formation
	Artinskian
	Asselian
	Autunian
	Barakar Stage
	Cherry Canyon Formation
	Leman Sandstone Formation
	Leonardian
	Opeche Shale
	Qixia Formation
	Sakmarian
	Wichita Group
	Wolfcampian
RT	Guadalupian
	Kungurian
	Guandacol Formation
	Rotliegendes
	San Gregorio Formation
	Upper Permian
	Middle Permian
	Bird Spring Formation
	Itarare Subgroup
	Laborcita Formation
	Oquirrh Formation
	Pictou Group
	Stockton Formation
	Tensleep Sandstone
	Tubarao Group
	Wild C