Biostratigraphy and paleobiogeographic affinities of the Jurassic brachiopod assemblages from Sierra Espuña (Maláguide Complex, Internal Betic Zones, Spain)

Abstract

The assemblages of Early Jurassic brachiopods (Pliensbachian -Toarcian) from Sierra Espuña (Murcia Province, SE Spain) are described.

New deep-water brachiopod resilient assemblage from the South-Iberian Palaeomargin (Western Tethys) and its significance for the brachiopod adaptive strategies around the Early Toarcian Mass Extinction Event

“…This latter material was directly examined by one of the authors (FGJ). Previous data from the Internal Betic Zone (Baeza-Carratalá et al 2011) and the Iberian Range (García Joral et al 2011) have also been taken into account (Fig. 4A).…”

“…Records of this species in nearby basins are constrained to the mirabile Subzone in Algeria (Elmi et al 2006, Alméras et al 2007; the mirabile-semicelatum subzones in Portugal (Comas-Rengifo et al 2013, and the semicelatum Subzone in Pyrenees (Alméras et al 2007). In fact, apart from this new record in the CE section, the presence of the representatives of the Order Spiriferinida above the polymorphum-serpentinum boundary are restricted to the La Almunia section (Iberian Range;García Joral et al 2011) andPortugal (Comas-Rengifo et al 2013). These authors recorded L. falloti and L.?…”

“…The present work regards these phases taking into account recent data on the evolutionary history of brachiopods around the ETMEE (e.g. Vörös 2002Vörös , 2005García Joral et al 2011;Baeza-Carratalá et al 2015;Comas-Rengifo et al 2015;Gómez et al 2016) by adding biochronological data acquired from the westernmost Tethys areas (Braga 1983;Jiménez 1986;Sandoval et al 2012;Comas-Rengifo et al 2013Reolid et al 2014a, Baeza-Carratalá et al 2015, and also analyzing the correlation with the isotopic curve fluctuations and palaeotemperature data in several peri-Iberian basins (Gómez & Goy 2011, García Joral et al 2011, Sandoval et al 2012.…”

“…Nevertheless, the remaining fauna and geochemical proxies (Reolid et al 2014a) suggest a younger date for this assemblage within the elegantulum Subzone and the NJT6 Zone (CNZ), but without reaching the upper part of this subchronozone, as indicated by the FOD of Soaresirhynchia bouchardi, regarded as an initial coloniser in the extinction aftermath in most of the Western Tethyan basins (e.g. García Joral & Goy 2000, García Joral et al 2011, Baeza Carratalá et al 2011, Andrade et al 2016. This is consistent with the record of an early T-OAE pulse in the CE section plausibly in the basal layers of the serpentinum Zone (Reolid et al 2014a), bearing in mind that the expanded section in the CE area supports a significant thickness for the basal serpentinum Zone deposits.…”

“…Harries & Little 1999, Dera et al 2010, Suan et al 2010, Gómez & Goy 2011, García Joral et al 2011. This relatively long phase represents the so-called "extinction interval" where diverse environmental changes or pulses occurred.…”