IODP SEDIS - Thesaurus -

Alexandrian
BT	Chronostratigraphic Units
	.Phanerozoic
	..Paleozoic
	...Silurian
	....Lower Silurian
	.....Alexandrian
UF	Alexandrian Series
SN	North American provincial series. Lower Silurian (above Cincinnatian of Ordovician, below Niagaran).

Alexandrian Series
USE	Alexandrian