IODP SEDIS - Thesaurus -

Ypresian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Eocene
	.....Ypresian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Cenozoic
	...Paleogene
	....Eocene
	.....lower Eocene
	......Ypresian
NT	London Clay
SN	Europe. Above Thanetian (Paleocene), below Cuisian.