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Title

Cistoideos rombíferos (Echinodermata) de la Caliza Urbana (Ordovícico Superior) de la Zona Centroibérica, España

Other TitlesRhombiferan cystoids (Echinodermata) from the Urbana Limestone (Upper Ordovician), Central Iberian Zone, Spain
AuthorsGutiérrez-Marco, J. C.
KeywordsOrdovícico
Kralodvoriense
Ashgill
Echinodermata
Rhombifera
Descripción Sistemática
Ordovician
Kralodvorian
Hesperian Massif
Macizo Hespérico
Systematic description
Issue Date2001
PublisherUniversidad Complutense de Madrid
CitationColoquios de Paleontología, 2001,52: 107-116
Abstract[ES] Los cistoideos son fósiles sumamente escasos en la Caliza Urbana de la región surcentroibérica, en contraste con otras unidades calcáreas del Kralodvoriense (Ashgill «medio») de la Península Ibérica, donde su registro es abundante y variado. En esta nota se recapitulan y discuten todos los hallazgos previos de estos equinodermos en la Caliza Urbana (7 ejemplares en total), identificándose dos formas distintas de Heliocrinites (Heliocrinites cf. minutus CHAUVEL y Heliocrinites sp. -aff. H. jaekeli? CHAUVEL-) más otro rombífero indeterminable (Rombifera indet.), que se asimilan desde el punto de vista paleobiogeográfico a la «fauna de Heliocrinites». La extrema rareza de cistoideos en la Caliza Urbana se atribuye a factores paleoambientales y sedimentarios desfavorables, verificados en el seno de una plataforma interna muy somera y de escaso gradiente. Entre ellos podría citarse una energía elevada, el influjo terrígeno y el predominio de sustratos semiconsolidados, que tendría su contrapunto en los restantes depósitos ibéricos del tipo de «calizas de pelmatozoos », donde los ambientes más tranquilos o profundos de la plataforma externa serían mucho más proclives a su colonización por equinodermos.
[EN] Cystoids are very rare fossils in the Urbana Limestone of the southern Central Iberian Zone, in contrast to the fossil content of the remaining Kralodvorian («mid» Ashgill) limestones cropping out in the Iberian peninsula, where these echinoderms display a more abundant and diverse record. After a complete recapitulation and discussion about all findings of cystoids in the Urbana Limestone (only 7 specimens derived from 4 localities among dozens of sections examined), two different species of Heliocrinites (Heliocrinites cf. minutus CHAUVEL and Heliocrinites sp. -the latter perhaps related with H. jaekeli? CHAUVEL-) and one undetermined rhombiferan (Rombifera indet.) have been identified. From a palaeogeographic point of view, these elements belong to the «Heliocrinites Fauna» and its extreme rarity in the Urbana Limestone may be consequence of non-favourable environmental factors, such as a high energetic gradient and terrigenous influx, or the predominance of semiconsolidate substrates within a very shallow and nearly flat inner shelf setting. The opposite scenario, much more suitable to be colonyzed by echinoderms, is characteristic of the «pelmatozoan limestones» known in other Iberian areas, which generally were deposited in quieter and deeper environments of the outer shelf.
Publisher version (URL)http://www.ucm.es/BUCM/revistas/geo/11321660/articulos/COPA0101110107A.PDF
URIhttp://hdl.handle.net/10261/8516
ISSN1132-1660
E-ISSN1988-2580
Appears in Collections:(IGE) Artículos
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