238 PHYSIOGRAPHY AND GEOLOGY OF THE COASTAL PLAIN PROVINCE. 



At the bank of the Suffolk Clay Company, the section shows : 



Feet 



Top soil 1 



Yellow clay 3 



Blue clay, lower foot sandy 9 



Limonite sand 1 



Sand 8 



Blue marl 20 



For brick making the run of the bank, including the sand layer, is used. 

 The blue clay is not safe to use alone by any process of wet-molding, but it 

 gives a harder, denser body. The properties of the brick mixture (N"o. 

 1345) and the blue clay (No. 1341) are given in the table, opposite page 

 225. 



The following table gives the statistics of clay products in the Virginia 

 Coastal Plain from 1905 to 1909 inclusive, and is of interest to those who 

 desire to know something of the growth of the industry in the eastern part of 

 the State. 



Clay products in Virginia Coastal Plain from 1905 to 1909, inclusive.'^ 



o Includes Alexandria, Charles City, Chesterfield, Elizabeth City, Fairfax, Greenes- 

 ville, Henrico, James City, King George, Lancaster, Nansemond, Norfolk, Prince 

 George, Princess Anne, Spottsylvania, and VVanvick counties. 



6Includes Isle of Wight County, and the counties under (a) except Greenesville, 

 Princess Anne, and Spottsylvania. 



c Includes Isle of Wight and Sussex counties, and the covmties under (a) except 

 King George, and Spottsylvania. 



d Includes Caroline, Isle of Wight, and Sussex counties, and the counties under {a) 

 except Elizabeth City, Greenesville, and King George. 



e Includes Isle of Wight and Sussex counties, and the counties under ( a ) except 

 Caroline and Elizabeth City. 



Of the 17 counties producing in 1909, Alexandria, Henrico, Chesterfield, 

 and JSTansemond, in the order named, were the largest producers. During 

 1909, there were 9 producers in Alexandria County, 7 in Henrico, 6 in 



oFurnished by the courtesy of the Division of Mineral Resources, U. S. Geol. 

 Survev. 



