LEAD. 



58' 



A comparison of the sections in Figures 65 and 66 will show the close 

 structural relations of the two districts and the identical features in the mode 

 of accumulation of lead deposits. 



The workings in this field have not been extensive, but there are two or 

 three localities, not widely separated, from each of which a small amount of 

 galena has been taken. These spots are marked upon the plan (Fig. .66) by 

 asterisks. Mr. McMillan has dug some small shallow shafts at the contact of 

 the granite with the Cambro-Silurian limestones, and a very similar set of 

 conditions is evident in the tract further south at the Pedernales River, and 

 on the land of Mr. Holden, nearly east from McMillan's, at old Westbrook 

 Postomce. These are all parts of the same ore field, and the prevailing con- 

 ditions are alike in all, none of the features being essentially different from 

 what has been observed in the Burnet County tract previously described. 



THE MASON COUNTY TKACT, OR CAYLOR DISTRICT. 



This area was noted in the last Report.* While the conditions affecting 

 the occurrence of lead at this point are much the same as those already no- 

 ticed under the two preceding heads, the complications in the structure are 

 far more confusing. The details shown in Fig. 67 give some idea of the dis- 

 turbances which have mangled the remnants of the lead bearing rocks, but it 

 is almost impossible to depict the contortions, displacements, and entangle- 

 ments which have ensued. 



Fig. 67. 



Section on line K-L of map (Plate XXI), crossing the Caylor tract on divide between Honey 

 and Little Bluff creeks, Mason County. 



* Pages 341 and 342. 



