Thin-shelled bivalve (“filament”) buildup of the Aalenian-lowest Bajocian in the Subbetic (South Iberian Paleomargin)

  1. José Miguel Molina 1
  2. M. Reolid 1
  3. E. Mattioli 2
  1. 1 Universidad de Jaén
    info

    Universidad de Jaén

    Jaén, España

    ROR https://ror.org/0122p5f64

  2. 2 Claude Bernard University Lyon 1
    info

    Claude Bernard University Lyon 1

    Villeurbanne, Francia

    ROR https://ror.org/029brtt94

Journal:
Geogaceta

ISSN: 0213-683X

Year of publication: 2017

Issue: 61

Pages: 31-34

Type: Article

DIALNET GOOGLE SCHOLAR lock_openArias Montano editor

More publications in: Geogaceta

Abstract

An exceptional buildup of thin-shelled bivalves (“filaments”) is reported from the External Subbetic. This is the biggest “filament” buildup related on the world (3.5 m thick and more than 12 m length). This work is focused in the characterization of microfacies and the preservation of “filament” accumulations. The analysis of assemblages of calcareous nannofossils allows the identification of the NJT8 biozone (Aalenian) below the buildup and the NJT9 bioz one (Bajocian) at the base of the buildup. The “filaments” are tentatively interpreted as Bositra, an opportunistic bivalve that flourished under stressed conditions in the water column related to trophic and oxygenation changes. They were accumulated in the bottom favoured by hydrodynamic conditions and sea-bottom topography.

Data source: Dialnet