. Acta Academiae Aboensis. Science; Mathematics. 128 SIERRA DE UMANGO of erosion was thence rejuvenating by way of linear cutting in the \ sheet flood planes and by a deepening of the corresponding valley J profiles. Some of the cones are to such a degree dissected by the young erosion, as to be changed into a „bad land" sculpture (north- ern end of the Cerro La Pampa). Many curious hilly forms have been shaped where the sheet flood gravel has endurated to a hard bed, mostly like mesetas and separated by steep canyons. The Lomas of Villa Union, as mentioned, remnants of a great cone-. Fif
. Acta Academiae Aboensis. Science; Mathematics. 128 SIERRA DE UMANGO of erosion was thence rejuvenating by way of linear cutting in the \ sheet flood planes and by a deepening of the corresponding valley J profiles. Some of the cones are to such a degree dissected by the young erosion, as to be changed into a „bad land" sculpture (north- ern end of the Cerro La Pampa). Many curious hilly forms have been shaped where the sheet flood gravel has endurated to a hard bed, mostly like mesetas and separated by steep canyons. The Lomas of Villa Union, as mentioned, remnants of a great cone-. Fiff. 23. A wiew of the eastern side of the Sierra de Umango ridge, looking north, along the „inter- montane zone". The pic ure demonirates the formation of piedmont (gravel covered slopes) cut across by young erosion. The arrow indicates the overthrust plane between the mountain block and the sediment zone. The stream bed of the Quebrada Cordobés in the foreground. surface extending from the Nevado toward the Pagancillo low- land, have all a table shape, due to the hardened gravel sheet very resistant to the erosion. The young erosion has also worked laterally in more advanced stages and thereby reduced the cones into flattopped ridges radia- ting from the apex of the former cone (see the terraces NE from the Villa Union.) In the valley bottoms, except in the Guandacol valley, there are. 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 perfectly resemble the original Åbo akademi (1918- ). Åbo : Åbo akademi
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectm, booksubjectscience
