Estudio paleontológico en las cuencas terciarias de Galicia
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1993
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Sociedad Geológica de España
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Abstract
Se ha realizado una prospección paleontológica en nueve cuencas terciarias gnllegas, con el fin dc prccisar su edad y condiciones pnleoombiclltales. Presentamos los resultados obtenidos en base a hallazgos de micromamíferos, grandes mamíferos, peces, macrorestos vegetales y moluscos en las cuencas de As Pontes (A Coruila) y Roupar (Lugo). Las arci llas de los niveles inferiores de As Pontes contienen roedores, cuya edad corresponde al principio del Oligoceno
superior (MP 25-26). Los lignitos inferiores han proporcionado un Antracotérido que probablemente corresponde también al Oligoceno. Las plantas de los niveles superiores pueden ser del Oligoceno o del Mioceno inferior. Las condiciones climáticas, siempre tropicales, debieron variar
de cálidas a húmedas. En las arcillas inferiores hay peces y moluscos tanto dulceacuícolas como eurihalinos, y moluscos marinos litorales. Se apoyan con estos datos las hipótesis de contemporaneidad entre las cuencas de As Pontes y Roupar, y su carácter parálico
Paleontological prospections have been mude in 9 tertiary basins from Galicia (NW Spain), in order to get information about their age and paleoenvironmental conditions. Here we present the results oblained on the basis of fossil micromammals, large mammals, fishes, plants and molluscs in two basins, As Pontes (A Coruña province) andd Roupar (Lugo province). Thc lower clay beds from the As Pontes succession contain rodemts indicating the beginning of the Late Oligocene (zones MP 25-26). The lower lignite levels provide a large Anthracotherid mammal, probably of Oligocene age. Plants from the upper levels may correspond to the Oligocene or to the Early Miocene. Climatic conditions, evenly tropical, seem to have changed from arid to humid. The lower clays contain fishes and molluscs, of both freshwater and euryhalyne type, and marine litoral molluscs. These data support the hypothesis of the contemporaneity between the As Pontes and Roupar basins, and their paralic conditions
Paleontological prospections have been mude in 9 tertiary basins from Galicia (NW Spain), in order to get information about their age and paleoenvironmental conditions. Here we present the results oblained on the basis of fossil micromammals, large mammals, fishes, plants and molluscs in two basins, As Pontes (A Coruña province) andd Roupar (Lugo province). Thc lower clay beds from the As Pontes succession contain rodemts indicating the beginning of the Late Oligocene (zones MP 25-26). The lower lignite levels provide a large Anthracotherid mammal, probably of Oligocene age. Plants from the upper levels may correspond to the Oligocene or to the Early Miocene. Climatic conditions, evenly tropical, seem to have changed from arid to humid. The lower clays contain fishes and molluscs, of both freshwater and euryhalyne type, and marine litoral molluscs. These data support the hypothesis of the contemporaneity between the As Pontes and Roupar basins, and their paralic conditions