Paroniceras, Frechiella y Oxyparoniceras (Ammonitida) en relación con las fluctuaciones térmicas y los ciclos transgresivo-regresivos detectados en el Toarciense de España
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2017
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Sociedad Española de Paleontología
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Abstract
El registro de las especies de Frechiella Prinz, 1904, Paroniceras Bonarelli, 1893 y Oxyparoniceras Guex, 1974 durante el Toarciense en el E y N de España, se ha relacionado con la evolución paleogeográfica y los ciclos deposicionales reconocidos en la Cordillera Ibérica. Sin embargo, es más evidente su relación con los intervalos de calentamiento relativo y picos térmicos, indicados por distintos autores en el Toarciense del norte y de la parte centro-oriental de la Subplaca Ibérica. Frechiella se ha registrado en la Zona Bifrons, Paroniceras en la Zona Variabilis y Oxyparoniceras en la parte superior de la Zona Thouarsense y parte inferior de la Zona Dispansum. La relación entre el registro de dichos géneros y las paleotemperaturas, parece indicar que sus especies se han desarrollado en medios cálidos y su presencia en las Cordilleras Ibérica y Cantábrica se debe a una migración desde otras áreas, sin que en todos los casos esto implique una colonización efectiva.
The record of species of Frechiella Prinz 1904, Paroniceras Bonarelli 1893, and Oxyparoniceras Guex 1974, throughout the Toarcian in the east and north of Spain, has been linked with the palaeogeographic evolution and the depositional cycles recognized in the Iberian Chain. However, the relationship between this record and the relative warming intervals and thermal peaks, pointed out by several authors in the Toarcian of Northern and East-Central part of the Iberian Subplate, is more evident. Frechiella has been recorded in the Bifrons Zone, Paroniceras in the Variabilis Zone, and Oxyparoniceras in the upper part of the Thouarsense Zone and the lower part of the Dispansum Zone. The relationships between the record of these genera and the palaeotemperatures may indicate that their species developed in warm environments. Thus, their presence in the Iberian and Cantabrian chains could be due to a migration from other areas, but not to an effective colonization.
The record of species of Frechiella Prinz 1904, Paroniceras Bonarelli 1893, and Oxyparoniceras Guex 1974, throughout the Toarcian in the east and north of Spain, has been linked with the palaeogeographic evolution and the depositional cycles recognized in the Iberian Chain. However, the relationship between this record and the relative warming intervals and thermal peaks, pointed out by several authors in the Toarcian of Northern and East-Central part of the Iberian Subplate, is more evident. Frechiella has been recorded in the Bifrons Zone, Paroniceras in the Variabilis Zone, and Oxyparoniceras in the upper part of the Thouarsense Zone and the lower part of the Dispansum Zone. The relationships between the record of these genera and the palaeotemperatures may indicate that their species developed in warm environments. Thus, their presence in the Iberian and Cantabrian chains could be due to a migration from other areas, but not to an effective colonization.