•240 PHYSIOGEAPHY AXD GEOLOGY OF THE COASTAL PLAIN PROVINCE. 



During his investigations of the Virginia Coastal Plain clays in the 

 summer of 1905, Dr. Heinrich Eies studied the molding sands in the 

 vicinity of Eichmond, Petersburg, and Fredericksburg. The samples of 

 these sands collected by Eies were analyzed by Messrs. Eoff and Gibboney, 

 with the results shown in the table which follows below. 



Analyses of molding sands from the Virginia Coastal Plain region. 



Constituents 



Silica (SiO,) 



Alumina ( ALOa ) 



Iron oxide ( FeoOa) 



Lime ( CaO ) 



Magnesia (MgO) 



Potash (K.O) 



Soda (Na,6) 



Titanic oxide (TiOo) 



Water (H„0) 



Water (moisture) 



Total. 



VII 

 Per cent 



84.40 

 7.56 

 2.52 

 0.06 

 0.21 

 1.29 

 0.65 

 0.44 

 1.99 

 1.76 



100.88 



VIII 

 Percent 



93 . 92 

 3.22 

 1.08 

 0.24 

 0.08 

 0.45 

 0.23 

 0.32 

 0.48 

 0.18 



100.20 



IX 

 Per cent 



85.04 

 5.90 

 3.18 

 O.OG 

 0.14 

 1.65 

 0.83 

 0.78 

 1.57 

 1.11 



100.26 



X XI 



Percent Percent 



86.24 

 6.32 

 2.44 

 0.34 

 0.10 

 1.38 

 1.13 

 0.02 

 2.94 

 1.29 



89.39 

 5.94 

 1.22 

 0.32 

 0.09 

 2.10 

 0.53 

 0.18 

 0.54 

 0.19 



102.20 100.50 



I. Bedford sand from foundry, Manchester, Virginia. 



II. Bedford yellow sand collected at pit. Manchester, Virginia. 



III. Coarse sand, Harbaugh pit, Richmond, Virginia. 



IV. Used molding sand, Eedford pit Manchester, Virginia. 

 V. Sand from near Petersburg, Virginia. 



VI. Blandford pit, Petersburg, Virginia. 



VII. Armstrong pit. Petersburg, Virginia. 



VIII. Sand from near Standard Brick Company, south of Suffolk, Virginia. 



IX. Griffith's pit, Fredericksburg, Virginia. 



X. Curlis pit, southeast of Lanexa, New Kent County, Virginia. 



XL One mile south of Layton, Essex County, Virginia. 



