Transactions . theast the peaks of another group of mountainsrising from the general plateau and forming a more eastern * For much assistance and cordial interest in the preparation of this paper,I desire to express my acknowledgments to Mr. E. D. Self, general manager ofthe mines at San Jose, and to Mr. W. H. Nichols, Jr., president of the San CarlosCopper Co. COPPER-DEPOSITS AT SAN JOSE, TAMAULIPAS, MEXICO. 179 uplift distinct from the main mountain system. The outlyinggroup is the San Carlos range, and is one of extreme geologicalinterest because of its nephelite-syenites and rare types ofa
Transactions . theast the peaks of another group of mountainsrising from the general plateau and forming a more eastern * For much assistance and cordial interest in the preparation of this paper,I desire to express my acknowledgments to Mr. E. D. Self, general manager ofthe mines at San Jose, and to Mr. W. H. Nichols, Jr., president of the San CarlosCopper Co. COPPER-DEPOSITS AT SAN JOSE, TAMAULIPAS, MEXICO. 179 uplift distinct from the main mountain system. The outlyinggroup is the San Carlos range, and is one of extreme geologicalinterest because of its nephelite-syenites and rare types ofassociated eruptives. These have been recently described byGeorge I. Finlay,1 who was my companion during the tripupon which the observations for the present paper were San Carlos mountains extend east and west, and are about15 miles long. Their highest point, Pic de Diablo, which isjust south of San Jose, has been determined by aneroid to be6,000 ft. above sea-level. The peaks are rugged, and have pre-. Fig. 1.—Map of North-Eastern Part of Mexico, the Circle Showingthe Location of the San Jose Deposits. cipitous escarpments, surrounding inner amphitheatres. Theyare clothed with a noble growth of pines in the upper portionsand receive enough precipitation to support a number ofbrooks, which, however, except in the wet season or imme-diately after heavy storms, are lost in the gravel of the arroyosbelow. The range soon dies out to the east of San Jose. Itsmain mass lies to the south. San Jose, the little town where the copper-mines are located, 1 The Geology of the San Jose District, Tamaulipas, Mexico, Annals of the NeioYork Academy of Science, xiv., 247-318, 1904. Eleven plates. 180 COPPER-DEPOSITS AT SAN JOSE, TAMAULIPAS, MEXICO. is situated in a valley on the northern side of the arroyo leads out to the northeast, and the pass to the southgoes around the eastern extremity of the nephelite-syenite, overa divide and south to the town of San Carlos. San
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