236 
Tkans ACTIONS Texas Academy of Science. 
Stkeeruwitz, W. H. Von. 
tilde, I took advantage of this, stopped the topographical parties inside 
of these boundaries, and commenced work upon the mineral district of 
tiie Carrizo Mountains and southern part of the Sierra Diabolo, with the 
Hazel mine and numerous outcrops and indications and a few prospects 
on silver-bearing copper ores. I mapped part of the country and took a 
number of sections, which will materially assist in the determination of 
the very extensive field of the crystalline schists and their relation to the 
plutonic and volcanic eruptive rocks, as well as of the superimposed sedi- 
mentary strata.” 'P. 20. 
The party under Mr. von Streeruwitz afterwards ‘h’econnoitered the 
Wiley Mountains, and later the northern portion of the Van Horn Moun- 
tains.” 
374. 
Report of. 
Third Ann. Kept, of the Geol. Surv. of Texas, 1891, pp. liii- 
liv. Austin, 1892. 
Administrative report. Field work begun May 15th, 1891. A party was 
organized with Messrs. Randolph Wyschetzki and Konrad G-irsewald as 
assistants. Meeting Mr. Goode, of the U. S. Geological .Survey engaged 
upon the topography of the country between the 31st and 32d degrees of 
latitude and the 105th and 106th degrees of longitude, the party remained 
within these limits to work up the mineral district of the Carrizo moun- 
tains and the southern part of the Sierra Diabolo. Silver-copper prospects. 
Part of the'^couiitry mapped, and sections made which will assist in the 
determination of the very extensive field of crystalline schists and their 
relations to other rocks. Unable to effect an extension of the sections 
to the Guadaloupe range on account of the worn condition of the outfit 
and the scarcity of food and water for the animals. Reconnoitered the 
Wiley mountains, and later the northern end of the Van Horn mountains. 
Left the field October 4th. Acknowledgments. 
375. 
Trans-Pecos Texas. 
Third Ann. Rept. of the Geol. Surv. of Texas, 1891, pp. 381- 
389. 1 plate. Austin, 1892. 
Contents: Geology. Mining. Hazel Mine. 
“The country west of the Pecos river, at least west of the divide run- 
ning from the Guadaloupe mountains down to the Rio Grande and crossing 
into Mexico, is sharply distinct from the country east of the Pecos river, 
for although we find in the Central Region (Llano and surrounding coun- 
ties) granites, crystalline schists, Silurian and Carboniferous rocks, meta- 
morphic material and perhaps Devonian strata, alike or similar to those 
of Trans-Pecos Texas, here we have to deal with geological problems of a 
different and far more complicated character. Some, I dare say most, of 
these proiblems can and will be understood fully only after the mountains 
of Old and Hew Mexico have been studied more in detail, because the 
