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Title: Siluro-Devonian graptolite stratigraphy of the Catalonian Coastal Ranges
Author: Julivert, M. (Manuel), 1930-
Durán Gilabert, Hortensia
Rickards, R. B.
Chapman, A. J.
Keywords: Estratigrafia
Serralada Litoral Catalana
Stratigraphic geology
Catalan Coastal Range (Catalonia)
Issue Date: 1987
Publisher: Universitat de Barcelona (UB). Institut de Ciències de la Terra Jaume Almera (ICTJA)
Abstract: Two facies characterize the Silurian and lower Devonian of the Catalonian Coastal Ranges, namely euxinic and pelagic carbonate facies. The first, is represented by black shales in which the atavus, acinaces, cyphus, triangulatus, convolutus, ?sedgwickii, ellesae and tumescens zones have been recognized. The graptolite succesion is far from complete on present evidence, but this is probably due to unfavorable environmental (taphonomic) conditions. This facies is similar to that prevailing throughout the Iberian massif and most of western Europe. The pelagic carbonate facies is peculiar to the Pridoli and lower Devonian and corresponds to the facies type prevailing in the Western Mediterranean Area. It is characterized by the nodular texture of limestones and marls, with all gradations between nodular limestones, marls and slates. Massive nodular limestone, occur in the lower part of the sequence (La Creu Formation) while the alternation of limestones, marls and slates charaterizes the upper part (Olorda Formation). Orthoconic cephalopds, crinoids, conodonts and tentaculites are the most common fossils present; graptolites occur in some shale horizons in the lower part of the Olorda Formation. These graptolites give strong indications of the uniformis and hercynicus zones (Lochkovian). The uppermost part of the sequence has not provided any graptolite fauna, but according their dacrioconarid fauna it corresponds probably to the Pragian.
Note: Reproducció del document publicat a:
It is part of: Acta Geologica Hispanica, 1987, vol. 20, num. 3/4, p. 199-207
ISSN: 0567-7505
Appears in Collections:Articles publicats en revistes (Educació Lingüística i Literària i de Didàctica de les Ciències Experimentals i de la Matemàtica)

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