Shawangunk Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Shawangunk Formation
RTOrdovician
 Silurian
 Pennsylvania
 New York
 New Jersey
SNUpper Ordovician to Middle Silurian. SE New York, N New Jersey, and N Pennsylvania. Indexed with ages as applicable. Added to Thesaurus in 1993.