Publication: Fontanarejo (Ciudad Real): una localidad icnológica excepcional del Ordovícico Inferior en los Montes de Toledo meridionales
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2017
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Sociedad Geológica de España
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Abstract
Se presenta el hallazgo de un gran afloramiento cuarcítico situado al este de Fontanarejo (Ciudad Real), afectado por una intensa bioturbación a cargo del productor de Daedalus desglandi (Rouault). La localidad se sitúa en los niveles inferiores de las “Capas Intermedias” (Arenigiense inferior) y el icnofósil corresponde a una excavación vertical con conexiones convexas, con desarrollo helicoidal hacia el interior, que se inicia desde un punto situado inicialmente en la interfase agua-sedimento, en un ambiente marino muy somero. La mayoría de los ejemplares observados son secciones transversales de D. desglandi conservados como epirelieves, que alcanzan la increíble densidad de 250-275 ejemplares/m2, en un área que podría alcanzar los 12000 m2. La magnitud de esta asociación icnoespecífica, tan masiva, convierte a la localidad en un referente único a nivel mundial del registro icnológico paleozoico, y promueve nuestra propuesta para que sea inventariada en la lista de los Lugares Geológicos Españoles de interés internacional.
Large bedding exposures, intensively bioturbated by the producer of Daedalus desglandi (Rouault), are reported from the lower part of the Ordovician succession (lower Arenigian “Intermediate Beds”) east of the town of Fontanarejo (Ciudad Real Province). This ichnofossil corresponds to a vertical spreiten burrow, spirally twisted inwards, initiated from a single point in the water-sediment surface on a very shallow marine environment. Most of the recorded specimens are transverse sections of D. desglandi in epirelief preservation, reaching a density of 250-275 specimens per square meter, and extending over an area up to 12000 m2. The magnitude of this extremely crowded monoichnospecific assemblage makes this locality unique in the world’s ichnological record for the Paleozoic and reinforces its future inventory in the list of the Spanish Geosites of international interest. Similar occurrences of D. desglandi in the Naturtejo Geopark of Portugal reached a maximum of 70 m2 (Serra de Muradal) and 700 m2 (Fonte Longa geosite) for epichnial records of a single bed.
Large bedding exposures, intensively bioturbated by the producer of Daedalus desglandi (Rouault), are reported from the lower part of the Ordovician succession (lower Arenigian “Intermediate Beds”) east of the town of Fontanarejo (Ciudad Real Province). This ichnofossil corresponds to a vertical spreiten burrow, spirally twisted inwards, initiated from a single point in the water-sediment surface on a very shallow marine environment. Most of the recorded specimens are transverse sections of D. desglandi in epirelief preservation, reaching a density of 250-275 specimens per square meter, and extending over an area up to 12000 m2. The magnitude of this extremely crowded monoichnospecific assemblage makes this locality unique in the world’s ichnological record for the Paleozoic and reinforces its future inventory in the list of the Spanish Geosites of international interest. Similar occurrences of D. desglandi in the Naturtejo Geopark of Portugal reached a maximum of 70 m2 (Serra de Muradal) and 700 m2 (Fonte Longa geosite) for epichnial records of a single bed.