Siliceous shale and thin-bedded chert of Black John chert. Texas, 1931.
Dates
Date Taken
1931-07
Summary
Album caption: Siliceous shale and thin-bedded chert of Black John chert. South side of Black John Canyon, 2 miles northwest of Figure Two Ranch, Van Horn quadrangle. culberson County,Texas. July, 1931.
Summary
Album caption: Siliceous shale and thin-bedded chert of Black John chert. South side of Black John Canyon, 2 miles northwest of Figure Two Ranch, Van Horn quadrangle. culberson County,Texas. July, 1931.
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