cemented pebbles and sand in unconformity

abstract age algae and angle angular art atop backdrop background beds between black break buried catskills cemented close compaction comparison conglomerate curious curriculum dating deductive deep deltaic deposition depth difference discordant embedded eroded erosion geologic geology geoscience greywacke horizontal inductive laws lichen method mountains older overlying pattern pebbles principles puzzle reasoning relative rock rocks rounded sand science scientific sedimentary sedimentation showing state strata stratigraphy stream superposition texture time type unconformity unknown unsorted weathering white york younger