Hampden Basalt  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Jurassic
 ....Lower Jurassic
 .....Hampden Basalt
RTMassachusetts
 Connecticut
 Newark Supergroup
SNIn Newark Supergroup. Central Connecticut and central Massachusetts. Overlies East Berlin Formation. Previously thought to be Upper Triassic in age. Added to Thesaurus in 1989.