REPORT OF THE STATE GEOLOGIST. XXV11 



fully verified the results of Dr. G. G. Shumard's work in regard to ar- 

 tesian water supply, and ascertained the probable absence of deposits 

 of ores or coal in the region. Upon his return from this trip he re- 

 signed from the Survey. The results of his work will be found among 

 the papers accompanying this Keport 



CENTRAL TEXAS. 



Dr. Com stock took the field this year under instructions to complete 

 his general work in the regions which he was unable to reach the pre- 

 vious season, and to give especial attention to working out the mineral 

 resources of his district as fully as possible. The work was carried on 

 as far as possible with these ends in view, but the difficulties arising 

 from the fenced up condition of the country, lack of suitable roads, and 

 often of water, provisions, and feed for teams accessible to the places at 

 which work was contemplated, rendered it impossible to do all that was 

 anticipated. His general route was from near Burnet south and west 

 by Flat Kock Creek and Bound Mountain, through Blanco and Gillespie 

 counties, with excursions into the southern part of Llano County in 

 working out the geology of Honey Creek Cove and the Riley Moun- 

 tains. Then through Mason, Kimble, Menard, and Concho counties as 

 rapidly as possible, tracing the western boundary of his district. 



Following the northern boundary through McCulloch County he then 

 turned into the region of Katemcy, Fredonia, and Cherokee to Silver 

 Mine Hollow, Burnet County, at which point I joined his party for 

 a few days. From there his party worked south and came into Austin. 



This general route was interrupted by frequent trips tow T ard the inte- 

 rior of the district for the examination of such localities as had been 

 passed by during the last year for lack of time, but the hindrances 

 mentioned above proved so great that it was found impossible to visit 

 all that he wished. In November Dr. Comstock also devoted a week 

 to the field study of the district in which tin was discovered by him. 



The results of this season's work fully confirm the general statements 

 made regarding the stratigraphic geology of the region in the First An- 

 nual Report, while in economic results it has given returns of greatest 

 value. Among them may be noted the mapping of the area of the Burnet 

 marbles, the various outcrops of granites, special study of the lead- 

 bearing districts already known and the discovery of new ones, the 

 study of the brines, the mapping of the general outcrops of the veins of 

 iron ores, more detailed study of the gold, silver, and copper ores of 



