Succession of rudistid lithosomes along the western coastal margin of the Iberian Basin (Coniacian,Castrojimeno Section,central Spain) |
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Authors: | Javier Gil Jose Maria Pons Manuel Segura |
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Institution: | 1.Departamento de Geología, Facultad de Ciencias,Universidad de Alcalá,Alcalá de Henares,Spain;2.Departament de Geologia, Facultat de Ciències Edifici Cs,Universitat Autònoma de Barcelona,Bellaterra,Spain |
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Abstract: | Rudistid lithosomes cropping out near Castrojimeno, at the northern margin of the Central System in north-central Spain, provide
detailed information on their composition and structure, on their development and succession, and about their relationship
with the Coniacian sequence stratigraphy framework of the Iberian Basin. Most rudist assemblages are oligospecific, with a
dominant species, or monospecific. The radiolitids Biradiolites angulosus, Praeradiolites requieni, and Radiolites sauvagesi and the hippuritids Hippurites incisus and Vaccinites giganteus were identified. Radiolitids demonstrate wide intraspecific morphological variability. The following Riding’s structural
categories of organic reefs are represented: segment reefs, spaced and close cluster reefs, and close cluster/frame reefs.
Bioclastic beds of reworked rudist fragments occur below or in between the rudist reefs. The vertical succession of all five
types of rudistid lithosomes distinguished evidences a shallowing-upward trend. Rudistid lithosomes developed on the coastal
margin during the superposition of the highstand sea-level stage of third- and fourth-order depositional sequences. |
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