MARYLAND GEOLOGICAL SURVEY 59 



has produced an extensive sand spit, known as Cove Point. The third 

 and last locality is in the vicinity of Drum Point, where the low terraces 

 which line the Patuxent Eiver terminate abruptly on the bay shore. 



To the three terraces just described, a fourth may be added, although 

 it does not form a conspicuous element in the topography. This fourth 

 terrace is the beach and the wave-built flat which extends out along the 

 shores of the Patuxent Kiver and Chesapeake Bay. It is everywhere 

 present, and its width depends in a large measure upon the force of the 

 tidal currents which sweep over it. 



Taken as a whole, the divide of the county is lowest in its southeastern 

 portion between Cove Point and Hellen Creek, where it has an elevation 

 of only 127 feet; from this point it rises gently until it attains its high- 

 est altitude in the vicinity of j\It. Harmony near the northern edge of 

 the county, where it reaches a height of about 180 feet. 



THE DRAINAGE OF CALVERT COUNTY. 



Calvert County, occupying as it docs the soutliern extension of one of 

 the largest peninsulas in southern Maryland, is entirely surrounded by 

 water except along its northern border, where it abuts against Anne 

 Arundel County. Its eastern margin is washed by the waves of Chesa- 

 peake Bay and its western and southern margins terminate witli the 

 Patuxent Eiver. These two bodies of water receive the drainage of the 

 entire county. The divide which separates the headwaters of the streams 

 which flow into Chesapeake Bay on the east and the Patuxent Eiver on 

 the west is an extremely circuitous line (see map). It enters Calvert 

 from Anne Arundel County at a point almost three miles from the bay 

 shore. From here it runs south and then southwest to Mi. Harmony, 

 From this point it extends due south to the lower Marlboro-Prince Fred- 

 erick district line and then runs due east along the district line to The 

 Willows. South from The Willows to Prince Frederick the divide 

 describes the letter S, and from Prince Frederick to Port l^epublic 

 follows very closely the line of the proposed Baltimore and Drum Point 

 Eailroad. At Port Eepublic it runs rapidly eastward, striking the bay 

 shore about a mile west of Point of Eocks. Here it advances inland 



