. Acta Academiae Aboensis. Science; Mathematics. DETRITIC FORMATIONS 79 the sandstone and the slate of the zone have been intensely torn to a mylonitic mass of grayish colour. Following the fault farther northward in the direction of the Corral Martinez (lying on the eastern border of the zone) there always meet the same lower Gondwana rock series, downpressed and torn along the dislocation line. In some parts, however, the rocks have remained more un- broken and there the original lithology can be studied. In the vici-. Flg. 12. The „intermontane sandstone zone" (dotted), strongly disloc
. Acta Academiae Aboensis. Science; Mathematics. DETRITIC FORMATIONS 79 the sandstone and the slate of the zone have been intensely torn to a mylonitic mass of grayish colour. Following the fault farther northward in the direction of the Corral Martinez (lying on the eastern border of the zone) there always meet the same lower Gondwana rock series, downpressed and torn along the dislocation line. In some parts, however, the rocks have remained more un- broken and there the original lithology can be studied. In the vici-. Flg. 12. The „intermontane sandstone zone" (dotted), strongly dislocated. In tlie background the Cerro Villa Union. Sketch from the eastern slope of the Sierra de Umango ridge, toward the SE. nity of the Corral Martinez the writer has observed a vertically in- clined part of a clayish slate, apparently a pelodite. The rock ex- poses (reminding of the quaternary banded clay in the Baltic basin of Fennoskandia) a conspicuous alternation of clayish and sandy layers in quick succession. In the sandy layers, (corresponding to the „summer"-deposits) I discovered carbonized remains of plants with an air of a Gondwana flora. Thinned and torn coal seams are outcropping some hundred meters to the south of this 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
