Fig. 3. a, Overlying unstratified yellow sand. b, Thin deposit of laminated iron ore or ferruginous sandstone. c, Stratified red and white sand. d, Mottled unstratified sand.

Fig. 3.
a, Overlying unstratified yellow sand. b, Thin deposit of laminated iron ore or ferruginous sandstone. c, Stratified red and white sand. d, Mottled unstratified sand.

from

SECOND ANNUAL REPORT OF THE GEOLOGICAL SURVEY OF TEXAS, 1890.
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