MARYLAND GEOLOGICAL SURVEY 



151 



The coarseness of the <::rain? forming this soil is indicated hy the 



analyses of typical soil and subsoil 



Mechanical Analyses of Windsor Sand. 



No. 



6167 

 5168 



Local it J'. 



Description. 



a 



(U 



'a 



bo 



1 mile E. of Prince 

 Frederick. 



P.ct 



Coarse sand and 0.97 



gravel, to 13 



inches. 



Subsoil of 5167 Coarse sand and 1.03 



gravel, 13 to 40 

 inches. 



S 

 B 



2 



25 



10.31 



8.88 



e 



o 



OS 



S3 

 O 



/•.ff . P.ct . 



34.75 

 30.93 



?a 



« q 



>> 



« 

 !> 



a 



E 

 S 



o 

 o 



OQ 



o 



o 



-«:> . 



«a 

 sa 



o 



ei 

 O 



P.ct. P.ct. p.ct. 

 4.52 9.85 2.66 



6.10 15.28 4.55 



The Norfolk Sand. 



The Norfolk sand is found along the sides of all the deeper stream 

 cuts in the southern portion of the county, and it occupies about 

 50 per cent of tlie land surface in the northern half of the county, 

 covering slopes and upland alike except where other upland soil types 

 still exist in fragmentary areas. 



The surface of this formation, where it occurs along stream valleys, is 

 generally quite steeply inclined ami often precipitous. As a result 

 most of the areas of this type in southern Calvert County are occupied 

 by growths of pine, being too steep to permit agricultural operations. 

 In the northern part of the county and along certain stream terraces, 

 like those in the Hunting Creek valley, the Norfolk sand forms one 

 of the most important soil types. 



The Norfolk sand, as a soil type, owes its origin to three different 

 methods of derivation. The greater number of the areas of this soil, 

 found in Calvert County, are derived from the outcrops of layers of 

 sandy material deposited under water during Miocene and Pleistocene 

 time. Two of the sub-divisions of the Miocene are made up 

 largely of medium-grained sands, interspersed with thin strata of clay 

 and layers of shell marl. One member of the Pleistocene, found lying 



