lake ontario southern shoreline of rocks and pebbles

abundance ancient background beach beachcombing beauty busy collect collection colorful colors concept conceptual conglomerate continental copyspace earth earthscience education epidote eroded erosion fossiliferous fossils geologist geology glacial glaciation glaciers gneiss granite greatlakes hard igneous lake lakeshore limestone metamorphic mineral newyorkstate nys ontario origin pebble plethora region rocks round sandstone sandyisland science sedimentary serpentinite shoreline smooth stones teaching treasure types unique winnowing