A total of 208 boreholes with continuous core sampling, drilled for the construction of the high-speed train line through the city of Barcelona and other nearby infrastructures, were studied. The correlation of the lithologic logs of these boreholes allows identifying five main depositional sequences bounded by sharp erosional surfaces: i) lower Miocene, of alluvial origin; ii) middle Miocene, of deltaic-lacustrine origin; iii) lower Pliocene, of beach-shelf origin; iv) Pleistocene, of alluvial origin and v) Holocene, of deltaic origin. The erosive surfaces that separate these sequences represent important erosive hiatus linked to prolonged sea level falls at regional scale, which eliminated the upper part of each one. Sedimentation took place during decreasing intensity of extensional tectonic activity that mainly affected the Miocene deposits. The Plio-Quaternary units show their original structure apparently without tectonic alterations. Some new biostratigraphic data based on foraminifer assemblages allowed making accurate estimate of the age of the deposits.
El llibre presenta un total de 33 exercicis de mapes geològics, de nivell bàsic, per a estudiants dels diferents graus de la UPC que cursin assignatures de geologia bàsica i aplicada. Cada capítol fa una introducció breu dels principals conceptes geològics per tal de poder abordar els exercicis amb els coneixements suficients. Són exercicis que, més enllà de resoldre l’estructura geològica del mapa, plantegen resoldre també alguns problemes de projecte d’obres públiques simples. Als primers capítols, s’exposa la base teòrica per poder representar les unitats geològiques en un mapa topogràfic i fer-ne talls. Tot seguit, es presenten mapes amb els principals tipus d’estructures geològiques per separat: monoclinals, dics, discordances, falles i plecs. Al darrer capítol, es recullen exercicis de mapes multiestructurals, més propers a la realitat, que comporten més dificultat i que introdueixen el concepte d’història geològica.
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