. First[-fourth] annual report of the Geological survey of Texas, 1889[-1892] Edwin T. Dumble, state geologist. FERma> * TEXAN B URNETAN FERNAND ASltfad ?4 BNn. Fig. 69. Plan and section along line O-P of map (Plate XXI), showing structure in neighborhood ofShaft Mountain, Mason County, and southward. 602 CENTRAL MINERAL REGION OF TEXAS. The prolongation westward of the Burnetian axis, from Barringer Hill,passes considerably north of the left hand end of the section in Figure 68. Asthe discoveries of cassiterite seem thus far to belong to one narrow belt trend-ing north 75° west from Barrin
. First[-fourth] annual report of the Geological survey of Texas, 1889[-1892] Edwin T. Dumble, state geologist. FERma> * TEXAN B URNETAN FERNAND ASltfad ?4 BNn. Fig. 69. Plan and section along line O-P of map (Plate XXI), showing structure in neighborhood ofShaft Mountain, Mason County, and southward. 602 CENTRAL MINERAL REGION OF TEXAS. The prolongation westward of the Burnetian axis, from Barringer Hill,passes considerably north of the left hand end of the section in Figure 68. Asthe discoveries of cassiterite seem thus far to belong to one narrow belt trend-ing north 75° west from Barringer Hill, it is probable that the region inwhich tin ore will eventually be mined, if ever commercially important, willbe limited to a belt somewhat narrower than that indicated upon the map(Plate XXII); and as the outcrops are restricted and more or less confusedby later deposition and disturbances, it is reasonable to expect that certainsituations will yield better than others along the line. At present the indi-cations are best in eastern Llano County and northwestern Mason County,but I have traced the peculiar glistening titaniferous iron ores through
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