218 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
B. Slate colored, soft, friable, little altered. From near Bagley Creek. 
C. Same locality as B, less friable, but considerably altered. 
D. Slate colored, friable. From Arroyo del Cerro. 
E. Very friable. Same locality as D. 
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F. Neocomian shale, altered, light brown, friable. From near Arroyo del Cerro. 
G. Calcareous shale, near Arroyo del Cerro. Hard, compact, dark colored. Very 
much altered. 
H. Red shale, metamorphic area at head of Bagley Creek. 
I. Silicified shale or phthanite, same locality as H. 
J. Clay slate, near the head of Yaqui Gulch, in Mariposa County. Described by 
Turner in Bull. 150, p. 342. Contains grains of quartz and feldspar, abundant car- 
bonaceous particles, a chloritic substance (?), and a fibrous alteration of sillimanite (?). 
Analysis by George Steiger, record No. 1643. 
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