The Ordovician‒Silurian boundary beds in the El Pintado section (Sierra Morena de Sevilla Global UNESCO Geopark, SW Spain) Juan Carlos Gutiérrez-Marco, Sara Romero, Sofia Pereira, Petr Štorch Geologica Balcanica, 2024 The El Pintado 1 section of the Ossa-Morena Zone (Valle syncline, SW Spain) includes a rather continuous stratigraphic succession ranging from the Upper Ordovician to the Devonian, including remarkably fossiliferous black graptolitic shales that begin their sedimentation in the basal Silurian Akidograptus ascensus graptolite Biozone. The investigation for the location of the Ordovician–Silurian boundary in previous beds has produced negative results, due to the existence of a probable basal gap equivalent to the lower part of the aforementioned biozone, and the absence of stratigraphically relevant fossils, such as graptolites or conodonts, that could provide a high-resolution biostratigraphy to the Hirnantian succession. Nonetheless, some interesting records of rare shelly fossils in the Valle Shale (Hirnantian) are presented, and the Rhuddanian graptolite biozonation in the lower 38 m of the Lower Graptolite Shale (Rhuddanian to Ludfordian) is discussed.
The trilobite assemblage of the Declivolithus Fauna (lower Katian, Ordovician) of Morocco: A review with new data Sofia Pereira, Isabel Rábano, Juan Carlos Gutiérrez-Marco Journal of Paleontology, 2024 Intense commercial exploitation of fossils in the famous El Qaid Errami area in the last 20 years has led to the discovery of the interesting Declivolithus Fauna in the Moroccan Anti-Atlas. This unusually large trinucleid trilobite, described originally from the Czech Republic, is the most conspicuous element of an assemblage mainly occurring in the Bofloss locality, a local biofacies development of pelagic mudstones and sandstones cropping out in a structurally isolated place in the Tizi n'Ounfite area. Here we revise this Declivolithus Fauna trilobite assemblage from Morocco, increasing the known trilobite diversity from four to 11 species: Ulugtella? biformis n. sp., Selenopeltis cf. S. vultuosa, Phacopidina quadrata, Eudolatites cf. E. bondoni, Prionocheilus cf. P. verneuili, Nobiliasaphus cf. N. kumatox, Cyclopyge cf. C. rediviva, Symphysops stevaninae, Heterocyclopyge sp., Dionide sp., and Declivolithus alfredi. The new data and the very good preservation of specimens in sandstones, clarify the specific identity of previously reported taxa. Although the stratigraphical correlation of the fossiliferous levels remains problematic, it probably corresponds to the upper part of the Lower Ktaoua Formation or to the lower half of the Upper Tiouririne Formation. Most taxa support previous assignment of the Moroccan assemblage to the late Berounian (ca. early Katian, Ka2), although a middle Berounian (ca. Sa2–Ka1) age cannot be excluded. Most of the identified species are known from the Czech Republic (eight out of 11), showing that the strong faunal link between Morocco and the Czech Republic still existed during the Late Ordovician, being stronger than the link with the coeval Ibero-Armorican domain faunas.UUID: http://zoobank.org/3e6e55c7-168d-4008-98ba-38a795581ca3
A new trilobite locality from the Agüeira Formation (Upper Ordovician) of the Vega de Espinareda synclinorium (West Asturian-Leonese Zone, NW Spain) and its stratigraphical interest Sara Romero, Sofia Pereira, Ramiro López Medrano, Francisco Arias Ferrero, Isabel Rábano, et al. Geogaceta, 2024 Se presenta una nueva localidad paleontológica del Ordovícico del noroeste de España, ubicada en el flanco meridional del sinclinorio de Vega de Espinareda, al norte de Ponferrada (provincia de León). Se trata de la octava localidad con fósiles esqueléticos encontrada en la Formación Agüeira (Ordovícico Superior) del Dominio del Navia-Alto Sil de la Zona Asturoccidental-leonesa, y la primera ubicada en la mitad inferior de la formación. El nuevo yacimiento se sitúa muy próximo a su sección de referencia de la garganta fluvial entre las localidades de Congosto y Santa Marina del Sil, donde estos niveles eran interpretados como facies distales de un abanico submarino, en una sedimentación predominantemente turbidítica. Pero los trilobites, moluscos y braquiópodos encontrados, que por su escasa a nula desarticulación no parecen transportados, revelan una asociación propia de ambientes de plataforma mucho más someros, con fondos oxigenados como revela la alta concentración de galerías horizontales. La presencia de los trilobites Colpocoryphe grandis (Šnajdr) y Dalmanitina n. sp. (D. rabanoae Pereira, n. n.) indica una edad Berouniense temprano (= Sandbiense temprano), lo que abre la posibilidad de que el límite Ordovícico Medio/Superior se sitúe en los 400-450 m basales de la Fm. Agüeira en el sector estudiado.
Panderia beaumonti (Rouault, 1847) of the cabeço do peão formation of middle berounian (upper ordovician, portugal) Comunicacoes Geologicas, 2014
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