MARYLAND GEOLOGICAL SURVEY 



231 



covering, shallow or deep, depending on the location with reference 

 to the washing influence of rains. These residual soils are all derived 

 from the rocks which underlie them, or at most have been trans- 

 ported but very short distances. The soils consist of yellow and 

 brown loams, slightly sandy, and about 10 inches in depth. The sand 

 consists generally of sharp, angular grains of quartz, and frequently 

 small bits of the undecomposed granite or gneiss may be found mixed 

 with the soil particles. The subsoils are lighter in color and contain 

 a greater percentage of clay. They may be classed as light, yellow- 

 clay loams. Generally, these clay loams have a depth of 36 inches 

 or more, but they often grade into loose masses of decomposed gneiss 

 or granite at a depth of 30 inches, or occasionally at a depth of even 

 20 inches. In places the soil covering has a depth of several feet, but 

 these are rare occurrences. On the surface there is usually present 

 an appreciable amount of broken quartz and occasionally pieces of 

 granite, gneiss, schist, gabbro, or any of the rock formations from 

 which the soils are derived. Although the amount of stones may at 

 times equal 40 per cent, generally the amount is much less and does 

 not seriously interfere with cultivation. These stones range from 

 one-half inch to 6 inches in diameter. 



The following table gives the mechanical analyses of soils and sub- 

 soils of typical samples of Cecil loam: 



MECHANICAL ANALYSES OE CECIL LOAM. 



No. 



4029 

 4232 

 4030 

 4233 



Locality. 



Providence, 1 mile 



sw. 



Farmington, 2 miles 



NE. 

 Plum Point, 1 mile 



SW. 

 Subsoil of 4232 



Description. 



to 12 inches 



Yellow loam, to 



6 inches. 

 12 to 30 inches.... 



Stiff yellow loam, 

 6 to 24 inches. 



CI 

 «3 



B 



© 



o 



3 



© 



o 



$ 



© 



a 

 a 



© 



a 



+3 



© 



lO 



•a 



© 



+3 











a 





03 



a 

 p 



o 



CM 



© 

 > 



OS 

 GO 



© . 



a 



cS . 



m a 



Is 



©o 



a 



c3 



CO 



© a 



la 



o 



o 



s 



oS co 



£9 



0) 9 



hg 



© 



6CO 



a3 



%a 



.a a 



CDO 



+2 



o 



C6 



r J 



a 



& 



> 



QG 



P. ct. 



P. ct. 



P. ct. 



P. ct. 



P. ct. 



P. Ct. 



P. Ct. 



5.55 



3.02 



5.74 



12.64 



14.92 



13.90 



32.96 



5.18 



3.36 



8.52 



6.26 



14.10 



11.95 



31.67 



3.76 



2.21 



5.57 



4.18 



11.91 



13.21 



40.22 



4.81 



4.54 



10.01 



6.74 



13.79 



11.61 



27.19 



£s 



P. ct. 

 11.32 



19.32 



19.27 

 21.01 



