MARYLAND GEOLOGICAL SURVEY 



CAMBRIAN AND ORDOVICIAN, PLATE XVII 



FlG. I. AN AVERAGE EXAMPLE OF THE CAULIFLOWER CHERT FROM THE BASE OF 

 THE STONES RIVER LIMESTONE. VICINITY OF BOSTETTER, MARYLAND. 



FlG. 2. TYPICAL NATURAL OUTCROP OF UPPER STONES RIVER LIMESTONE IN CLEARED 

 FIELDS, ONE-HALF MILE WEST OF PINESBURG, MARYLAND. THE GROWTH OF CEDAR TREES 

 ON THIS PURE LIMESTONE IS ILLUSTRATED. 



