. Acta Academiae Aboensis. Science; Mathematics. 76 SIERRA DE UMANGO ducts of the lower Gondwana members are represented in the form of boulders. The „grey psammite" of Bodenbender could not be the real „graywacke" of glacial origion but must correspond to the upper, pale-coloured, psammitic layers of the lower Gondwana. Then follows over the „gray psammite" a red, apparently triassic sandstone. As to the writers studies of the strata in the profiles along the Quebrada Banda Florida and the dry gorge of the Rio de los Noques, running along the inside of the bordering sandstone m
. Acta Academiae Aboensis. Science; Mathematics. 76 SIERRA DE UMANGO ducts of the lower Gondwana members are represented in the form of boulders. The „grey psammite" of Bodenbender could not be the real „graywacke" of glacial origion but must correspond to the upper, pale-coloured, psammitic layers of the lower Gondwana. Then follows over the „gray psammite" a red, apparently triassic sandstone. As to the writers studies of the strata in the profiles along the Quebrada Banda Florida and the dry gorge of the Rio de los Noques, running along the inside of the bordering sandstone mantle, the succession here is: over the crystalline rocks (quartzite schist). Fig, 11. An erosion remnant of red Gondwana sandstone, lying on a' tilted crystalline basement block. Looking north from the Cerro Punta Colorada, eastern side of the Cerro Villa Union. lies a pale yellowish sandstone as the lowermost member. The li- thological character of this rock shows a great resemblance with the lower pale sandstones in the Cerro Guandacol profile. A distinct crosscurrent bedding reminds one much of the pelodite-sandstones in the classic profile at Jachal, containing small scattered boulders too. This sandstone is succeeded by a pale brown sandstone of psammitic character, overlaid with a mighty, very coarse conglome- rate of dark brown colours. The boulders of this conglomerate, well waterworn and lying stratified with sandy interstratifications, all consist of old crystalline rocks. Upward follows then a mighty. 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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