96 



THE GEOLOGY OE ST. IMAKY S COUNTY 



rieistocene. 



*j .2 



lis 



I. SccUoii oit Dull shore at Langlci/s Bluff, 



Sandy loam containing scattered gravel. 



Coarse gravel 



Cross-bedded gravel and sand 



Fossilif erous greenish clay 



^'ery coarse gravel 



Feet. Inches. 



^ 3: Fosslliferous sandy clay occuring at beach level and 

 S g^ extending downward to unknown depth. 



Total 23 



II. Section on Potomac Itiirr at Wailes Bluff. 



d fSandy loam 



o 71 Sandj' loam carrying gravel 



Pleistocene. ^ ^ -i Cross-bedded sand and gravel 



fi g Sandy clay carrying Ostrea and Venus 



&■ [Bluish clay, very fossilif erous, extending below tide. 



Total 12 



III. Section on Potomac Hirer hctu-em Flood and Poplar Hill Creeks. 



Feet. 

 ^ g fSandy loam 1 



»,, . , S3 Gravel and sand with ice-borne boulders 4 



Pleistocene. :2 cs J „ , 



a g I Gravel 2 



^ o Dark clav bearing plant and invertebrate remains. ... 3 



fa L ' 



Total 10 



IV. Section along Potomac Hirer 1.5 miles south of Sotterlii Point. 



Feet. 



[ Sandy loam 3 



bi„i„*„„„„„ - 5 Cross-bedded white sand 3 



Pleistocene. = ^^ J ^ , , , , . . , , 



; Dark drab clay carrying vegetable remains extending 



downward indefinitely beneath tide 2 



Total S 



THE BECENT DEPOSITS. 



The materials which constitute the Becent dejDOsits consist of mud, 

 clay, sand, and gravel. These are deposited in deltas, flood plains and 

 beaches, in the valleys of rivers and estuaries. The deposition of deltas 

 and flood plains has been going rapidly forward, at least since the settle- 

 ment of the country by Europeans. Men are still living who distinctly 



