<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Espejo, J M Recio</style></author><author><style face="normal" font="default" size="100%">Faust, D</style></author><author><style face="normal" font="default" size="100%">Granados, M A Nuñez</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">The origin of the Sierra de Aracena Hollows in the Sierra Morena, Huelva, Andalucia, Spain</style></title><secondary-title><style face="normal" font="default" size="100%">Geomorphology</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">deep weathering</style></keyword><keyword><style  face="normal" font="default" size="100%">hercynian massif</style></keyword><keyword><style  face="normal" font="default" size="100%">hollows macroforms</style></keyword><keyword><style  face="normal" font="default" size="100%">sierra morena</style></keyword><keyword><style  face="normal" font="default" size="100%">Spain</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2002</style></year></dates><volume><style face="normal" font="default" size="100%">45</style></volume><pages><style face="normal" font="default" size="100%">197-209</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Hollows in the Sierra de Aracena, part of western sector of Sierra Morena region (Huelva, Spain), are geoecologically unusual macroforms. They are underlain by deeply weathered bedrock but have eutrophic soils with distinctive vegetation. Paleosols with very dark colours, a predominance of smectites and large amounts of total and free iron occur on the floors on the hollows. An evolutionary model is proposed for the hollows, involving differential weathering during the Mesozoic on plutonic and amphibolitic rocks, alpine tectonic activity followed by Quaternary erosion and exhumation leading to formation of erosional terraces</style></abstract></record></records></xml>