Alexandrian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Silurian
 ....Lower Silurian
 .....Alexandrian
UFAlexandrian Series
SNNorth American provincial series. Lower Silurian (above Cincinnatian of Ordovician, below Niagaran).
Alexandrian Series  search
USEAlexandrian