SLATES AND SHALES. 213 
E. Red slate from quarry 3 miles north of Raceville 
F. Green spot in E. 
G. Purple rim of green spot I’. 
Analyses by W. F. Hillebrand, record No. 1656. 
Contain trace of lithia and nickel. Fluorine not determined. 
PENNSYLVANIA. 
Slates from Lehigh and Berks counties, collected by T. Nelson Dale. Analyses by 
W. F. Hillebrand, record No. 2015. Rocks A, B, described in Bull. 275, p. 84. 
A. Black roofing slate, Washington vein, Hazel Dell quarry, north of Slatington. 
Sp. gr., 2.780, 21°. 
B. Black roofing slate, lower Franklin vein, old Franklin quarry, Slatington. 
Sp. gr., 2.783, 21°. 
C. Black roofing slate, partly weathered, 1} miles northwest of Waxatawny, Berks 
County. Dark variety. 
D. Like CG, light variety. ' 
E. Weathered slate or “shale clay,’’ one-half mile south of Fogelsville. 
F. Like E, one-fourth mile from Guth Station, South Whitehall. 
H20 at 105°... 
H20 above 105°. 
Carbonaceous matter 
15619—Bull. 419—10—15 
