"milk small boulders. These are still rounder and in sizes from 1 to 4 inches averaging between 1 and 2 inches. In general it may be said as we go down in the Pottsville that the pebbles of white quartz become smaller and on the average are certainly smaller below than at the top. The top measures I only saw from the automobile but the lower beds have pebbles from 3/4 to 3 1/2 inch averaging about 1/2 inch. There are beds of 1 foot thickness up to several feet separated by coarse quartzose sandstones. The basal Pottsville is a thick zone of conglomerate probably 6 feet thick. It rests on greenish shales somewhat sun-cracked and has earned some into it. The question is not yet settled that this is the basal bed for there is a transitional series below that may date Pottsville.