REPORT OF THE STATE GEOLOGIST. XXI 



The following is a list of the topographic map sheets of this State 

 which were engraved up to the first of December, 1890 : 



Bastrop, 



Burnet, 



Meridian, 



Austin, 



Llano, 



Hamilton, 



Blanco, 



Mason, 



Brownwood, 



Fredericksburg, 



Gatesville, 



Coleman, 



Kerrville, 



Lampasas, 



Granbury, 



Taylor, 



San Saba, 



Stephenville, 



Georgetown, 



Brady, 



Breckenridge. 



CO-OPERATION OF THE UNITED STATES COAST AND 

 GEODETIC SURVEY. 



Assistant Stelman Forney, of the United States Coast and Geodetic 

 Survey, left Washington late in November for El Paso, where he will 

 begin the reconnaissance for primary triangulation. His scheme will 

 follow the general direction of the Mexican boundary line, and will be 

 connected with the base lines measured by this Survey and by the 

 United States Geological Survey. 



WORK OF THE STATE SURVEY. 

 TRANS-PECOS TEXAS. 



In this district an effort was made by Prof. Streeruwitz, assisted by 

 Mr. Wyschetzki, to complete the section begun last year by mapping 

 the area between the Quitman Mountains and the Kio Grande. This 

 was, however, found to be impracticable on account of lack of facilities 

 for securing supplies and the impassable condition of the old roads 

 south of the mountains. It was therefore thought best to map in the 

 Diabolo and Carrizo mountains on the northeast, which was accord- 

 ingly done. 



The accuracy of the work done in this district is fully established by 

 Dr. Woodward's remeasurement of many of the angles with instruments 

 of great precision, with resulting differences well within the limit of 

 error of the smaller instrument belonging to the Survey, and his verifi- 

 cation of the Texas Base Line to within 3S * 6 . 



For the benefit of the surveyors of West Texas Dr. K. S. Wood- 

 ward, of the United States Geological Survey, in connection with Prof. 

 Streeruwitz, erected monuments in the vicinity of Torbert, giving the 

 true north and south line, and also an accurately measured line for the 



