Explorations and field-work of the Smithsonian Institution in .. . Fig. 5.—Popocatepetl, Mexicos famous volcanic peak. ( Photograph hyT. Skewes Saunders.). Fig. 6.—Tasco. The first mining by Europeans in tiie Western Hemispherewas carried on in the hill behind the tree to the right. 8 SMITHSONIAN INSTITUTION We next turned north to Namiquipa and Sabinal, where there areother silver mines, and then north again, following the course ofthe Rio Santa Maria. The country became increasingly more aridand desolate until at last we reached the Barrcalcs, a forbidding stretchof country, very different i
Explorations and field-work of the Smithsonian Institution in .. . Fig. 5.—Popocatepetl, Mexicos famous volcanic peak. ( Photograph hyT. Skewes Saunders.). Fig. 6.—Tasco. The first mining by Europeans in tiie Western Hemispherewas carried on in the hill behind the tree to the right. 8 SMITHSONIAN INSTITUTION We next turned north to Namiquipa and Sabinal, where there areother silver mines, and then north again, following the course ofthe Rio Santa Maria. The country became increasingly more aridand desolate until at last we reached the Barrcalcs, a forbidding stretchof country, very different in aspect from the pleasant barrancas wehad so recently left behind. Instead of deep canyons clad in pinesand live-oaks, we saw a flat sun-baked plain, almost devoid of vegeta-tion, a country so level that no water drained from it. Here and thererose from the plain small but rugged mountain ranges of tilted andfolded Cretaceous limestone, almost as verdureless as the plain intrusions of granitic rock into these limestones formed depositsof gold, silver, and copper. Such a deposit in the Sierra de LosMuertos engaged our attention becaus
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1912
