WAlum Shale Formation
WAnzaldo Formation
WBellevue Formation
WBull Fork Formation
WCancañiri Formation
WChazy Formation
WCorryville Formation
WEverton Formation
WFolkeslunda Limestone
WGrant Lake Formation
WGull River Formation
WHolston Formation
WIndependencia Formation
WIscayachi Formation
WKope Formation
WLa Ciénega Formation, Bolivia
WLetná Formation
WLiberty Formation
WMartinsburg Formation
WMesón Group
WObispo Formation, Bolivia
WPircancha Formation
WQueenston Formation
WReedsville Formation
WRockdale Run Formation
WRoubidoux Formation
WSan Benito Formation, Bolivia
WSan Juan Formation, Argentina
WSan Lorenzo Formation, Bolivia
WSantiago Formation, Bolivia
WSella Formation
WShakopee Dolomite
WTarija Concha Formation
WTetreauville Formation
WTrenton Formation
WTucumilla Formation
WVerulam Formation
WVogtendorf Formation
WWaynesville Formation
WWhitewater Formation