MARYLAND GEOLOGICAL SURVEY 



CAMBRIAN AND ORDOVICIAN, PLATE VIII 



FIG. i. EXPOSURE OF ELBROOK LIMESTONE ALONG BALTIMORE AND OHIO RAILROAD JUST 



SOUTH OF SHARMAN, MARYLAND. THESE MASSIVE BEDS WEATHER INTO THIN SHALY 

 LAYERS. 



FlG. 2. VIEW LOOKING NORTH OVER ANTIETAM BATTLEFIELD SHOWING EXPOSURE OF 

 ELBROOK LIMESTONE. PHOTOGRAPH TAKEN ONE-HALF MILE EAST OF SHARPSBURG, ALONG 

 ROAD TO BURNSIDE BRIDGE, MARYLAND. 



