MARYLAND GEOLOGICAL SURVEY 



CAMBRIAN AND ORDOVICIAN, PLATE XIII 



FlG. I. EXPOSURE OF STEEPLY INCLINED STONEHENGE LIMESTONE (UPPER DIVISION) AT 

 CHARLTON, MARYLAND, SHOWING THE DISINTEGRATION INTO SILICEOUS SHALE, UPON PRO- 

 LONGED WEATHERING. 



FlG. 2. TYPICAL EXPOSURE OF EDGEWISE CONGLOMERATE FROM THE UPPER PART OF THE 

 STONEHENGE LIMESTONE, BALTIMORE AND OHIO RAILROAD, ONE MILE NORTH OF BALLS, MARY- 

 LAND. 



