Publication: Nuevos fósiles del Pragiense (Devónico Inferior) del Geoparque
Mundial de la UNESCO Montañas do Courel (Lugo, NO de España)
y sus implicaciones geológicas
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Publication Date
2022
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Sociedad Geológica de España
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Abstract
Se presentan los primeros fósiles devónicos reconocidos en el sinclinorio del Sil (Lugo, NO de España), encontrados en rocas calcáreas incluidas en un contexto local cartografiado como pizarras ordovícicas, lo que sugiere la necesidad de abordar una investigación estructural y estratigráfica más detallada. El yacimiento paleontológico se vincula con calizas que contienen una acumulación excepcional de dacrioconáridos aparentemente monoespecífica, un grupo fósil que se reconoce por vez primera en Galicia. La identificación de Nowakia cf. acuaria (Richter) permite atribuir al Pragiense el afloramiento estudiado, y correlacionarlo tentativamente con la parte más alta de la Formación Salas en sus afloramientos del extremo oriental del sinclinorio, ya en la provincial de León. Una interpretación alternativa sería considerar a esta caliza como un olistolito en la base del olistostroma + flysch carbonífero de San Clodio. Atendiendo al interés científico de tipo paleontológico, estratigráfico y estructural, la localidad ha sido inscrita como nuevo Lugar de Interés Geológico del Geoparque Mundial de la UNESCO Montañas do Courel.
For the first time, Devonian fossils are recognized in limestonesof the Sil synclinorium (Lugo, NW Spain). Within this tectonic structure, the outcrop was interpreted as belonging to Ordovician shales, although observation of Devonian strata recommended a more detailed stratigraphical and tectonic investigation of the area. The palaeontological site contains an exceptional accumulation of dacryoconarids, apparently monospecific (Nowakia cf. acuaria (Ritchter)), a group never recognized before in Galicia. This species allows the attribution of these limestones to the Pragian (Lower Devonian), which are roughly correlated with the upper part of the Salas Formation of the eastern end of the synclinorium, in León province. An alternative interpretation would be to consider this limestone block as an olistolith at the base of the Carboniferous olistostrome + flysch of San Clodio. Taking into consideration the palaeontological, stratigraphical and structural interest of the outcrop, it has been inscribed as a new Geosite of the Courel Mountains Global UNESCO Geopark.
For the first time, Devonian fossils are recognized in limestonesof the Sil synclinorium (Lugo, NW Spain). Within this tectonic structure, the outcrop was interpreted as belonging to Ordovician shales, although observation of Devonian strata recommended a more detailed stratigraphical and tectonic investigation of the area. The palaeontological site contains an exceptional accumulation of dacryoconarids, apparently monospecific (Nowakia cf. acuaria (Ritchter)), a group never recognized before in Galicia. This species allows the attribution of these limestones to the Pragian (Lower Devonian), which are roughly correlated with the upper part of the Salas Formation of the eastern end of the synclinorium, in León province. An alternative interpretation would be to consider this limestone block as an olistolith at the base of the Carboniferous olistostrome + flysch of San Clodio. Taking into consideration the palaeontological, stratigraphical and structural interest of the outcrop, it has been inscribed as a new Geosite of the Courel Mountains Global UNESCO Geopark.