MARYLAND GEOLOGICAL SURVEY 



CAMBRIAN AND ORDOVICIAN, PLATE XXI 



FlG. I. VIEW IN THE TABLER QUARRY JUST SOUTH OF FREDERICK, MARYLAND, 

 SHOWING THE MASSIVE BEEKMANTOWN LIMESTONE OVERLAID BY THE) THIN-BEDDED 

 FREDERICK LIMESTONE WITH A DISTINCT LINE OF UNCONFORMITY SEPARATING THEM. 



FlG. 2. FOLD IN SANDY UPPER (EDEN) PORTION OF MARTINSBURG SHALE ALONG WESTERN 

 MARYLAND RAILWAY, THREE-FOURTHS MILE WEST OF WILLIAMSPORT, MARYLAND^ 



