{"id":139044,"date":"2014-10-29T08:00:21","date_gmt":"2014-10-29T06:00:21","guid":{"rendered":"http:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/?p=139044"},"modified":"2014-09-18T18:43:15","modified_gmt":"2014-09-18T16:43:15","slug":"pruebas-de-la-accion-glacial-en-sudamerica-en-el-parrafo-sexcentesimo-quincuagesimo-septimo-del-origen-de-las-especies","status":"publish","type":"post","link":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/2014\/10\/29\/139044","title":{"rendered":"Pruebas de la acci\u00f3n glacial en Sudam\u00e9rica en el p\u00e1rrafo sexcent\u00e9simo quincuag\u00e9simo s\u00e9ptimo del Origen de las Especies"},"content":{"rendered":"<p>Se exponen algunas pruebas de la acci\u00f3n glacial en Sudam\u00e9rica.<\/p>\n<p><em>\u00a0<\/em><\/p>\n<p style=\"text-align: justify;\"><em>\u00a0<\/em><\/p>\n<p style=\"text-align: justify;\"><em>657<\/em><\/p>\n<p style=\"text-align: justify;\"><em>Looking to America: in the northern half, ice-borne fragments of rock have been observed on the eastern side of the continent, as far south as latitude 36 and 37 degrees, and on the shores of the Pacific, where the climate is now so different, as far south as latitude 46 degrees. Erratic boulders have, also, been noticed on the Rocky Mountains. In the Cordillera of South America, nearly under the equator, glaciers once extended far below their present level. In central Chile I examined a vast mound of detritus with great boulders, crossing the Portillo valley, which, there can hardly be a doubt, once formed a huge moraine; and Mr. D. Forbes informs me that he found in various parts of the Cordillera, from latitude 13 to 30 degrees south, at about the height of 12,000 feet, deeply-furrowed rocks, resembling those with which he was familiar in Norway, and likewise great masses of detritus, including grooved pebbles. Along this whole space of the Cordillera true glaciers do not now exist even at much more considerable heights. Further south, on both sides of the continent, from latitude 41 degrees to the southernmost extremity, we have the clearest evidence of former glacial action, in numerous immense boulders transported far from their parent source.<\/em><\/p>\n<p style=\"text-align: justify;\"><em>\u00a0<\/em><\/p>\n<p style=\"text-align: justify;\"><em>Por lo que se refiere a Am\u00e9rica, en su mitad norte se han observado fragmentos de roca transportados por el hielo, en el lado este del continente, hasta la latitud de 36\u00ba-37\u00ba, y en las costas del Pacifico, donde actualmente el clima es tan diferente, hasta la latitud de 46\u00ba. Tambi\u00e9n se han se\u00f1alado cantos err\u00e1ticos en las Monta\u00f1as Rocosas. En Am\u00e9rica del Sur, en la cordillera de los Andes, casi en el Ecuador, los glaciares llegaban en otro tiempo mucho m\u00e1s abajo de su nivel actual. En la regi\u00f3n central de Chile examin\u00e9 un gran c\u00famulo de detritus con grandes cantos que cruzaba el valle del Portillo, y que apenas puede dudarse de que en otro tiempo constituyeron una morrena gigantesca; y m\u00edster D. Forbes me inform\u00f3 que en diferentes partes de la cordillera de los Andes, entre 13\u00ba y 30\u00ba de latitud sur, encontr\u00f3, aproximadamente a la altura de 12.000 pies, rocas profundamente estriadas, semejantes a aquellas con que estaba familiarizado en Noruega, e igualmente grandes masas de detritus con guijarros estriados. En toda esta extensi\u00f3n de la cordillera de los Andes no existen actualmente verdaderos glaciares, ni aun a alturas mucho m\u00e1s considerables. M\u00e1s al Sur, a ambos lados del continente, desde 41\u00ba de latitud hasta el extremo m\u00e1s meridional, tenemos las pruebas m\u00e1s evidentes de una acci\u00f3n glaciar anterior, en un gran n\u00famero de inmensos cantos transportados lejos de su lugar de origen.<\/em><\/p>\n<p style=\"text-align: justify;\">\n<p>Lectura aconsejada:<\/p>\n<ul>\n<li><a href=\"https:\/\/digital.csic.es\/handle\/10261\/76630\"> Manual para detectar la impostura cient\u00edfica: Examen del libro de Darwin por Flourens.<\/a> Digital CSIC, 2013. 225 p\u00e1ginas.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Se exponen algunas pruebas de la acci\u00f3n glacial en Sudam\u00e9rica. \u00a0 \u00a0 657 Looking to America: in the northern half, ice-borne fragments of rock have been observed on the eastern side of the continent, as far south as latitude 36 and 37 degrees, and on the shores of the Pacific, where the climate is now so different, as far south as latitude 46 degrees. Erratic boulders have, also, been noticed on the Rocky Mountains. In the Cordillera of South America, nearly under the equator, glaciers once extended far below their present level. In central Chile I examined a vast mound\u2026<\/p>\n","protected":false},"author":86,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[467,10238],"tags":[],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":4}},"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Se exponen algunas pruebas de la acci\u00f3n glacial en Sudam\u00e9rica. 657 Looking to America: in the northern half, ice-borne fragments of rock have been observed on the eastern side of the continent, as far south as latitude 36 and 37 degrees, and on the shores of the Pacific, where the climate is now\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Emilio Cervantes\"\/>\n\t<link rel=\"canonical\" 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