Congresos Científicos de la Universidad de Murcia, Congreso Internacional sobre Desertificación

Tamaño de fuente: 
Minor Forms in a Badlands Landscape Framework
J.L. Díaz-Hernández, J. Yepes, A. Romero-Díaz

Última modificación: 24-09-2009

Resumen


We describe and classify some medium-scale erosional morphologies in badlands areas. They have been categorized in three different types: A) Surficial forms on horizontal surfaces (soil surface crusts, cracks, popcorn) and walls (“slips”, pseudo-stalactites). B) Punctual fingerprints: rain impact and micro-collapses (dimples). C) Ruiniform morphologies (caves, shelters, residual pinnacles). The A-type shapes are caused by damping-desiccation phenomena on clayey soils; morphologies on walls are due to laminar runoff on weak lithologies (clay, loam), also dubbed pseudo-speleothemes. Their scale is centimetric-decimetric. B-type forms may be an external passive process (impact) or an internal dynamic process (dimples) occurring in granular sediments inside shelters, in conditions of apparent calm, measuring up to a few centimetres. The caves and shelters of type C generally involve an excavation following stratification or jointing planes, while the residual pinnacles are vertical forms linked to advanced piping and fluting. Both forms are decametric in scale.

Palabras clave


Badlands; slips; dimples; micro-collapses; pinnacles

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