W. H. Darton — Magothy Formation of Maryland. 409 



pressions. The Lafayette and Chesapeake formations form a 

 partial exception to this general statement for they overlap the 

 other formations in some localities, and their western extension 

 is now represented by small outliers occurring mainly in the 

 liigher lands to the northwest. The Columbia terraces extend 

 across the other formations from the crystalline rocks in the 

 depressions westward, to the Lafayette in the lowlands far to 

 southeastward. 



In southern Maryland the typical Coastal Plain topography 

 of the south Atlantic region prevails, an elevated east-sloping 

 plain capped by Lafayette formation, and holding sharply 

 depressed drainage basins lined with low Columbia terraces 

 which extend eastward into a wide low belt adjoining the 

 ocean. This east-sloping Lafayette plain has also a gradual 

 tilt northward and with increasing altitude it is more and more 

 widely eroded. Near the latitude of Washington it finally 

 terminates, except for a few small outliers, and through north- 

 eastern Maryland the region west of the bay, although still 

 elevated, is rolling in contour in the higher lands and occupied 

 by areas of Columbia terraces in the moderately elevated 

 and low districts. The entire country east of Chesapeake 

 Bay is a Columbia ten-ace relatively low throughout but 

 gradually increasing in altitude to the north and northwest. 



MAGOTHY 



ASSOCMTED rORMTIOHS 



