IODP SEDIS - Thesaurus -

Hettangian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Jurassic
	....Lower Jurassic
	.....Hettangian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Mesozoic
	...Jurassic
	....Lower Jurassic
	.....lower Liassic
	......Hettangian
SN	Europe. Above Rhaetian (Triassic), below Sinemurian.