WAgardhfjellet Formation
WAlcobaça Formation
WArcabuco Formation
WAreado Group
WBaños del Flaco Formation
WBazhenov Formation
WBhuj Formation
WCañadón Calcáreo Formation
WChacarilla Formation
WChon Aike Formation
WFernie Formation
WGirón Formation
WGuavio Formation
WHiguerueles Formation
WIouaridène Formation
WKadzi Formation
WKatrol Formation
WKimmeridge Clay
WKiyosu-e Formation
WKsar Metlili Formation
WLa Casita Formation
WLastres Formation
WLulworth Formation
WMorrison Formation
WMorrissey Formation
WMugher Mudstone
WPhu Kradung Formation
WPortland Group (geology)
WPortland stone
WRabekke Formation
WShaximiao Formation
WTalbragar fossil site
WTera Group
WToqui Formation
WTuchengzi Formation
WUkureyskaya Formation
WUlan Malgait Formation
WVaca Muerta
WValle Alto Formation
WVillar del Arzobispo Formation
WWalloon Coal Measures