Record of Geolooy of Texas, 1887-1896. 
233 
Streeruwitz, W. H. Von. 
water and food for horses. iWhile delayed the services of the party were 
offered to Dr. K. S. Woodward, Astronomer of the U. S. Geological Sur- 
vey, who was engaged in taking observations for the final determination 
of the 105th meridian. The locations of the various camps during the 
season are given. The work of Mr. Taff, Assistant Geologist, outlined. 
Air. Ralph Wyschetzki, Topographer, assisted by Mr. Leon Perl. Other 
difficulties encountered, such as the want of reliable maps, metamorphism, 
etc. The necessity of studying the older rocks in New Mexico and Arizona 
before reaching final conclusions in West Texas set forth. Mineral 
resources and building stones promise well. The climate, observed during 
two summers and two winters, the general lay of the land and the quality 
of the soil lead to the conclusion that ‘The conditions for a future use 
of the soils for agricultural and horticultural purposes are anything but 
hopeless.” 
370. — 
Report on the Geology and Mineral Resources of Trans-Pecos 
Texas. 
Chapters I-IV, inclusive. (For Chapter Y, see J. A. Taff.) 
Second Ann. Rept. of the Geol. Surv. of Texas, 1890, pp. 
665-713. 3 plates, including one of sections; topographic 
map. Austin, 1891. 
Contents : Chap. I. Definition of area included in the region. Chap. 
II. Descriptive Geology. Chap. III. Mineral Resources and Irrigation. 
.Hunter district; Bonanza district; Big Gulch or Silver King, district; 
Zimpleman’s Pass district; Sierra Blanca Junction; Eagle Mountains; 
Hills between the Texas and Pacific Railway and Cliffs of the Sierra Dia- 
bolo; Ornamental and Building stones; Irrigation; Development. Chap. 
IV. Minerals of Trans-Pecos Texas. 
“The present Report refers principally to the area mapped, topographi- 
eally, between longitude 104° 55' and 105° 35', and latitude 30° 55' and 
31° 10', .covering the east and west slopes of the Quitman Mountains 
(formerly Sierra de los Dolores) to the El Paso stage road; the Malone 
Hills; the southwestern part of the Sierra Blanca group, with Sierra 
Blanca Peak; the southwestern spur of the Sierra Disibolo; the western 
part of the Carrizo Alountains; and the northern foothills of the Eagle 
Mountains (Sierra del iCola del Aguila) ; the hills of the Devil’s Ridge 
(sometimes called the Devil’s Backbone) ; and the hill ranges between the 
Sierra Diabolo, Carrizo, Eagle Mountains, and the Quitman Range, with 
the intervening extensive flats. It refers also, as far as geography is con- 
cerned, to a part of Trans-Pecos Texas, which up to this time has not been 
worked up topographically and geologically, but which I have touched by 
reoonnoitering, such as the Guadaloupe Mountains, extending southward 
from New Mexico towards the foothills, and northern slope of the Davis 
(Apache or Limpia) Mountains, between the San Martin Springs and Van 
Horn. 
“This southern extension of the Guadaloupe Mountains, connecting with 
