IODP SEDIS - Thesaurus -

Berwick Formation
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...lower Paleozoic
	....Berwick Formation
RT	Ordovician
	Silurian
	New Hampshire
	Maine
	Merrimack Group
SN	In Merrimack Group. Probably Ordovician and Silurian. SW Maine and SE New Hampshire. Indexed with ages as applicable. Added to Thesaurus in 1989.