Name:  Quartz Conglomerate

Geologic Name:  Pottsville conglomerate

Reference:  Stone, R.W., Building Stones of Pennsylvania; Pennsylvania Geol.
Survey, 4th ser., Bull M15, p. 1990-200, 1932.

Microscopic characters:  The pebbles are sub-angular to rounded quartz with
undulatory extinction and numerous inclusions.  The cement is silica sometimes
arranged in a mortar structure around the poebbles.  Chlorite is common and 
there is some iron oxide present.  Rutile and some carbonaceous material are
also noted.