63 THE PHYSIOGRAPHY OF ST. MARY's COUNTY 



line wrapped about the Piedmont Plateau at an elevation of 500 feet or 

 more above the present sea level, and the valleys of the Appalachian 

 region may have been converted into fjords. 



Fig. 1. — Diagram showing the approximate position of the shore-line of the 

 Sunderland sea. 



THE SUNDERLAND STAGE. 



The Lafayette stage of terrace building was brought to a close by 

 the elevation of the region once more above the surface of the ocean. 

 Eain and rivers at once began to erode this new land surface and to 



