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Potsdam Sandstone  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Cambrian
 ....Upper Cambrian
 .....Potsdam Sandstone
RTOntario
 Quebec
 Vermont
 New York
 Little Falls Formation
SNUnderlies Ticonderoga Formation. Central and E New York, Vermont, E Ontario and S Quebec.