Síntesis paleontológica del Cámbrico y Ordovícico del Sistema Ib´rrico (Cadenas Ibéricas y Cadenas Hespéricas)

Abstract

Se analizan los datos de paleontología sistemática existentes en la bibliografía incorporándolos dentro de un esquema global junto a las unidades lito y cronoestratigráficas del Cámbrico y Ordovícico de las Cadenas Ibéricas y las Cadenas Hespéricas. Se pre­sentan las diferentes unidades bioestratigráficas definidas en estas regiones y se revisa su área geográfica de aplicación. Final­mente se refieren los problemas aun no resueltos.

Biostratigraphy of the Ribota and Huérmeda formations (Cambrian Series 2) in the Comarca del Aranda (Zaragoza province), Iberian Chains (NE Spain)

“…1) in the Eastern and Western Iberian Chain respectively, where three tectonostratigraphic units (Badules, Mesones and Herrera Units) have been defined (Lotze, 1929;Carls, 1983;Gozalo & Liñán, 1988). The lower Cambrian lithostratigraphic units of the Iberian Chains were defined by Lotze (1929Lotze ( , 1958Lotze ( , 1961, and the nomenclature for these units has been modified several times since then (see Liñán et al, 1996b, 2002, 2004. The Ribota Formation is a carbonate unit characterized by bedded to massive dolostone with various lutite and marl intercalations.…”

Middle Ordovician trilobites from the Castillejo Formation, Eastern Iberian Range (NE Spain): taxonomic reappraisal, biostratigraphy, and correlation

“…nobilis (Barrande) and Agygites glabala (Salter)", an association assigned to the lower Llandeilo. In their compilation of the Cambro-Ordovician taxa recorded in both branches of the Iberian Cordillera, Liñán et al (1996) listed the occurrence of a total of fifteen different Llandeilo trilobites in the Aragonese Branch. Among them, Crozonaspis armata Hammann and Placoparia (Coplacoparia) borni Hammann are cited for the first time in the upper part of the Sierra Member; however, localities were not specified.…”

“…10) note the occurrence of Placoparia borni Hammann, 1971 in the uppermost beds of the Castillejo Formation, dated as latest Llandeilo age. However, Placoparia has not been recognized in this stratigraphic position in any of the studied sections, and there is no reference to the species or to the locality in any of the articles cited by Liñán et al (1996) as the source of data for the Aragonese Branch.…”