. Bollettino della Geological Society of America. La geologia. Singhiozzare C. W. HAYES-GEOLOGIA OP NICARAGUA CANAL ROUTE dividere e le colline al confine con la pianura di Rivas. I resti di questa valle baseleveled si trovano nella parte superiore Tola bacino, mentre la porzione inferiore di tale bacino è molto perfettamente ridotto al presente baselevel, solo i vertici uniforna di poche colline arrotondate suggerendo l'ex-esistenza di un normale a un livello superiore. Nella parte superiore del Rio Grande Bacino di Rivas pianura può essere tracciata dalla sua tipica dello sviluppo presso il presente Continental Divide verso ovest attraverso la crescente gradi del dis

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. Bulletin of the Geological Society of America. Geology. Sob C. W. HAYES—GEOLOGY OP NICARAGUA CANAL ROUTE divide and the hills bordering the Rivas plain. The remnants of this baseleveled valley are found in the upper Tola basin, while the lower portion of that basin is very perfectly reduced to the present baselevel, only the uniforna summits of a few rounded hills suggesting the former existence of a plain at a higher level. In the upper Rio Grande basin the Rivas plain can be traced from its typical development at the present Continental divide westward through the increasing degrees of dissection to the summits of a few hills nearly down to the Tola. The inference, therefore, that the remnants of the plain observed in the upper Tola and in the upper Rio Grande valleys. Figure 1.—Basins of the Rio Grande and Rio Las Lajas. To illustrate recent shifting of Continental divide. were originally portions of the same baseleveled plain, is fairly well estab- lished. Accelerated by the lowering of its outlet, the diverted Tola has itself made considerable progress in the conquest of drainage formerly l)elonging to the eastward flowing streams. It has diverted branches both of the Gonzales and Medio, the reversed streams now forming the ('hacalapa and Matinga, and leaving low gaps in the present Continental divide. The Guachipilin, now flowing into the upper Rio Grande, formerly found an outlet eastward to the Medio. The latest diversion has evidently been the Guiscoyol, which was per- haps the largest stream in this region flowing eastward. Its source, now forming the headwaters of the Rio Grande, was in the high hills which border the lower Rio Grande valley. The Rio Grande is thus seen to have a composite course, which now makes a nearly complete circuit before reaching the sea.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfec

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• bookcentury1800
• bookdecade1890
• booksubjectgeology
• bookyear1890