A Kralodvorian (upper Katian, Upper Ordovician) benthic association from the Ferradosa Formation (central Portugal) and its significance for the redefinition and subdivision of the Kralodvorian Stage

 

Authors: Colmenar J, Pereira S, Pires M, Marques da Silva C, Sá AA, Young TP

Published in: Bulletin of Geosciences, volume 92, issue 4; pages: 443 - 464; Received 28 October 2016; Accepted in revised form 7 August 2017; Online 18 December 2017

Keywords: South Gondwana, Riba de Cima Member, Buçaco Syncline, upper Katian, Nicolella Fauna,

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Abstract

A new upper Katian (Kralodvorian Regional Stage) benthic association from the Riba de Cima Member of the Ferradosa Formation, Portugal, is described. It is dominated by bryozoans and echinoderms but brachiopods and trilobites are also present. More than 20 species of brachiopods, nine of trilobites and eight of echinoderms have been identified in the four studied localities. Among the brachiopods Kjaerina (Villasina) meloui Colmenar, 2016, Dolerorthis abeirensis Mélou, 1990 and Bicuspina cf. armoricana Mélou, 1990 are significant. These species were previously recorded only in the uppermost Rosan Formation (Armorican Massif, France). Porambonites dreyfussi Havlíček, 1981 is also reported in this paper for the first time besides its type horizon in the upper part of the Kralodvorian Gabian Formation (Montagne Noire, France). Most of the identified trilobite taxa were previously documented only in the Kralodvorian Cystoid Limestone Formation (Iberian Chains, Spain), except Parillaenus? cf. creber Hammann, 1992 and Amphoriops cf. inflatus (Hammann, 1992), whose referred species are also present in the upper Berounian-Kralodvorian Portixeddu Formation in Sardinia. The record of “Ceraurinus” meridianus (Hammann, 1992), “Bumastus” aff. commodus Apollonov, 1980 and Amphoriops cf. inflatus represent the first occurrence of these genera-groups in Portugal. These records are important additions to the knowledge of the Portuguese Late Ordovician benthic marine communities, providing crucial new data to constrain the biostratigraphy of the Riba de Cima Member and the palaeogeographical setting of this region at that time. In addition, some of the brachiopod occurrences with more restricted stratigraphical ranges provide invaluable tools for enabling more precise subdivision of the Kralodvorian regional stage.

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