Publication: Trilobites del Ordovícico Medio del sector meridional de la zona Centroibérica española. Parte I: Yacimientos, bioestratigrafía y aspectos
paleobiogeográficos.
Loading...
Official URL
Full text at PDC
Publication Date
1989
Authors
Advisors (or tutors)
Editors
Journal Title
Journal ISSN
Volume Title
Publisher
Sociedad Española de Mineralogía
Citations
Exportar
Abstract
El presente trabajo constituye el prólogo de un estudio sistemático detallado acerca del conjunto de trilobites ordovícicos registrados en las "Capas con Tristanl" (Llanvirn-Dobrotiviense) de la zona Centroibérica del Macizo Hespérico. En dichos materiales se encuentran representadas 61 formas de trilobites de los subórdenes Agnostina, Asaphina, Calymenina, Phacopina, Scutelluina, Odontopleurida y Lichlda, destacándose el hallazgo de varios géneros y especies nuevas. En esta primera parte se describen las localidades de procedencia del material (130 en total), repartidas en seis provincias de las Comunidades Autónomas de CastilfivLa Mancha, Extremadura y Andalucía ; así como las formas identificadas en cada una de ellas. El estudio bloestratigráflco ha permitido caracterizar las Biozonas Cambriensis (Llanvirn Inferior), Nava (Llanvirn Superior), Tournemini (Dobrotiviense Inferior, con tres Sub-biozonas: Macrophtalma-Toledana, Primitiva y Hupei), Borni (Dobrotiviense Superior) e lncerta (Dobrotiviense arenoso). Finalmente, el análisis paleobiogeográfico y paleoecológico de las asociaciones de trilobites estudiadas ha mostrado que su distribución depende en gran medida de la naturaleza y granulometría del sedimento. asi como de la profundidad. De este modo hemos podido diferenciar asociaciones concretas de trilobites durante el Uanvirn Inferior y finales del Dobrotiviense Inferior, que aportan datos indirectos acerca de la morfología de la plataforma marina centroibérica durante el Ordovícico Medio.
The "Tristani beds" (Ordovician: Llanvirn-Dobrotivá) of the Central-iberian zone of the Hesperian Massif have yielded 61 taxa of trilobites Agnostina. Asaphina, Calymenina, Phacopina, Scutelluina, Odontopleurida and Lichida. They have been thoroughly studled in this monograph, to be published systematically. The present paper constitutes the first chapter, in which 130 fossil localities distributed among 6 provinces of the Castilla- La Mancha, Extremadura and Andalucía Communities have been described. The biostratigraphical study allowed the characterizatlon of the following biozones: Cambriensis (Lower Llanvirn), Nava (Upper Llanvlrn), Tournemini (Lower Dobrotivá inqludlng three sub-biozones: Macrophtalma-Toledana, Primitiva and. Hupei), Borni (Upper Dobrotivá) and In certa (sandy facies). The paleobiogeographical and paleoecological analysis of the trilobite associations have proved that their distributions were largely influenced by the depth and sediment's nature and granulometry. Specific trilobite associations durlng Lower Llanvirn and late Lower Dobrotivá epochs have been laterally differentiated, providing indirect evidences about the morphology of the Middle Ordovician central-iberian marine shelf.
The "Tristani beds" (Ordovician: Llanvirn-Dobrotivá) of the Central-iberian zone of the Hesperian Massif have yielded 61 taxa of trilobites Agnostina. Asaphina, Calymenina, Phacopina, Scutelluina, Odontopleurida and Lichida. They have been thoroughly studled in this monograph, to be published systematically. The present paper constitutes the first chapter, in which 130 fossil localities distributed among 6 provinces of the Castilla- La Mancha, Extremadura and Andalucía Communities have been described. The biostratigraphical study allowed the characterizatlon of the following biozones: Cambriensis (Lower Llanvirn), Nava (Upper Llanvlrn), Tournemini (Lower Dobrotivá inqludlng three sub-biozones: Macrophtalma-Toledana, Primitiva and. Hupei), Borni (Upper Dobrotivá) and In certa (sandy facies). The paleobiogeographical and paleoecological analysis of the trilobite associations have proved that their distributions were largely influenced by the depth and sediment's nature and granulometry. Specific trilobite associations durlng Lower Llanvirn and late Lower Dobrotivá epochs have been laterally differentiated, providing indirect evidences about the morphology of the Middle Ordovician central-iberian marine shelf.