MARYLAND GEOLOGICAL SURVEY 



CAMBRIAN AND ORDOVICIAN, PLATE XIX 



FlG. I. PHOTOGRAPH SHOWING SUCCESSION OF SINKS ALONG THE BAND OF OUTCROP OF THE 

 STONES RIVER LIMESTONE, ONE-HALF MILE SOUTH OF WILSON, MARYLAND. THE ROAD TO THE 

 EAST FOLLOWS THE CHAMBERSBURG LIMESTONE. 



FlG. 2. NEAR VIEW OF A SINK FILLED WITH WATER. 



