EurekaMag.com logo
+ Site Statistics
References:
52,725,316
Abstracts:
28,411,598
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Rhombiferan cystoids Echinodermata from the Urbana Limestone Upper Ordovician, Central Iberian Zone, Spain Cistoideos rombiferos Echinodermata de la Caliza Urbana Ordovicico Superior de la Zona Centroiberica, Espana


Coloquios de Paleontologia, 52: 107-116
Rhombiferan cystoids Echinodermata from the Urbana Limestone Upper Ordovician, Central Iberian Zone, Spain Cistoideos rombiferos Echinodermata de la Caliza Urbana Ordovicico Superior de la Zona Centroiberica, Espana
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.


Accession: 038622193



Related references

Cistoideos rombiferos (Echinodermata) de la Caliza Urbana (Ordovicico Superior) de la Zona Centroiberica, Espana. Coloquios de Paleontologia 52: 107-116, 2001

On some pelmatozoan holdfasts Echinodermata from the Middle Ordovician of the Central Iberian Zone, Spain Estructuras de fijacion de pelmatozoos equinodermos en el Ordovicio Medio de la Zona Centroiberica espanola. Coloquios de Paleontologia, 49: 23-40, 1998

First Middle Ordovician record of Aristocystites metroi Parsley and Prokop, 1990 Echinodermata, Diploporita in the Central Iberian Zone Spain Descubrimiento de Aristocystites metroi Parsley y Prokop, 1990 Echinodermata, Diploporita en el Ordovicico medio centroiberico Espana. Geogaceta. Julio; 201: 225-227, 1996

Conodonts of the Urbana limestone formation Kralodvorian from the Guadalmez syncline Ciudad Real, Spain Conodontos de la Formacion Caliza Urbana Kralodvoriense en el Sinclinal de Guadalmez Ciudad Real, Espana. Coloquios de Paleontologia, 53: 69-85, 2002

Preliminary taphonomic study of the conodonts of the Cystoid Limestone Formation Upper Ordovician of the Piedra del Tormo section Iberian Cordillera, Zaragoza, Spain Estudio tafonomico preliminar de los conodontos de la formacion caliza de cistideos Ordovicico superior en la seccion Piedra del Tormo Cordillera Iberica, Zaragoza, Espana. Unknown, 2005

A revision of Douvillininae Brachiopoda from the southern Central-Iberian Zone Upper Devonian, Spain Revision de Douvillininae Brachiopoda de la Zona Centroiberica meridional Devonico Superior, Espana. Revista Espanola de Paleontologia. Marzo; 171: 157-164, 2002

A biostratigraphical review of the Middle Ordovician shales from NW Spain Cantabrian and Westasturian-Leonese zones, and northernmost part of the Central Iberian Zone Revision bioestratigrafica de las pizarras del Ordovicico Medio en el noroeste de Espana zonas Cantabrica, Asturoccidental-leonesa y Centroiberica septentrional. Acta Geologica Hispanica, 341: 3-87, 1999

Ordovician conodonts from the northeast of Spain Use of sedimentation model in the limitrophic regions between the zones of western Asturia-Leon and Central Iberia during the Upper Ordovician Conodontos ordovicicos del noroeste de Espana Aplicacion al modelo de sedimentacion de la region limitrofe entre las zonas Asturoccidental-Leonesa y centroiberica durante el Ordovicico Superior. Revista de la Sociedad Geologica de Espana, 123-4: 477-500, 1999

A taxonomical review of Echinosphaerites murchisoni Verneuil Barrande 1855 Echinodermata, Diploporita from the Middle Ordovician of the central Iberian zone, Spain Revision taxonomica de Echinospaerites murchisoni Verneuil y Barrande, 1855 Echinodermata, Diploporita del Ordovicio Medio centroiberiberico Espana. Geogaceta. Mayo; 27: 83-86, 2000

Tolmachovia babini nov sp, a new ribeirioid from the Middle Ordovician of the Spanish Central-Iberian zone Tolmachovia babini nov sp, nuevo ribeirioide Mollusca, Rostroconchia del Ordovicico medio de la zona centroiberica Espanola. Geobios Memoire Special (Villeurbanne): 20: 291-298, 1997