484 BULLETTN 109, UNITED STATES NATIONATi MUSEUM. 



College of Texas and P. S. Tilson appointed chemist. T. B. Cora- 

 stock was engaged for special work in the Llano region during 

 the summer months and later was appointed geologist. The United 

 States Geological Survey cooperated by detailing Robert T. Hill to 

 carry on the study of the Cretaceous in connection with his work at 

 the university during the latter part of the year. 



The importance of accurate topographic work was realized and 

 efforts were made to secure the cooperation of the United States Geo- 

 logical Survey and United States Coast and Geodetic Survey^, which 

 were partially successful. This was supplemented by the survey 

 through the work of J. C. Nagle in central Texas and E. Wyschetzki 

 in the trans-Pecos. 



Work of first year {1889). —Yon Streeruwitz completed his recon- 

 noissance of the trans-Pecos and in May began regular work there, 

 the first year being occupied principally in constructing a topo- 

 gi-aphic map of the western portion of El Paso County. 



Cummins made several sections across the northwestern portion of 

 the State from the escarpment of the Llano Estacado to the Cre- 

 taceous border on the east, and began the instrumental sections, which 

 were completed later. He had the assistance of Messrs. McCulloch 

 and Drake. R. S. Tarr, appointed in November, was given the study 

 of the southern border of the central coal field. 



Penrose spent the early part of the year in detailed examination 

 of Clierokee Countj^ with its iron ores and lignites. After this, in 

 order to get the Tertiary sections more complete, he made a boat 

 trip down the Brazos, Colorado, and Rio Grande. Penrose left the 

 survey on July 1 to study the extension of the Tertiary deposits in 

 Arkansas under the geological survey of that State while the iron- 

 ore areas of Texas were being mapped. The Arkansas work proved 

 to bo so extensive, however, that he finally resigned from the Texas 

 survey. G. E. Ladd was appointed to trace and map the iron-ore 

 deposits of east Texas, and M^orked in Wood. Upshur, Van Zandt, 

 Marion, and Anderson counties, and then resigned on account of 

 ill-health. A. G. Taff was appointed to continue this work, but died 

 before completing a single county. 



To Comstock was assigned the special work of studying the geology 

 and resources of the Llano district. AVith his party, which included 

 Messrs. Nagle, Spence, and Huppertz, he covered a large portion of 

 the area duriug the season and made large collections of the rock? 

 and minerals of the district. 



R. T. Hill, in connection with his work at the University of Texas, 

 was given the examination of the Cretaceous. His detail under the 

 United States Geological Survey for this work began in July. He 

 had as assistants Messrs. J. A. Taff, C. C. McCullocli, N. F. Drake, 



