Lowermost Silurian Graptolites of Montagne Noire, France

Twenty-seven graptolite species are reported from the lowermost Silurian (Rhuddanian) ascensus-acuminatus and vesiculosus biozones of Montagne Noire in southwestern France. Four species are left in open nomenclature, four are new: Normalograptus crassus, Neodiplograptus lautus, Dimorphograptus compa...

Full description

Saved in:
Bibliographic Details
Published in:Journal of paleontology 2008-09, Vol.82 (5), p.938-956
Main Authors: Štorch, Petr, Feist, Raimund
Format: Article
Language:English
Subjects:
biostratigraphy
biozones
Central Massif
Dimorphograptus compactus
Endangered & extinct species
English language learners
Europe
Excavations
Fauna
Fossils
France
Gabian France
Geology
Graptolithina
Graptoloidea
Herault France
Huttagraptus solidus
Invertebrata
invertebrate
lithostratigraphy
Llandovery
Lower Silurian
Montagne Noire
morphology
Neodiplograptus lautus
new taxa
Normalograptus crassus
Ocean circulation
Paleontology
Paleozoic
Paratypes
Physophora
Rhuddanian
s
Septum
Shales
Silurian
Specimens
Stratigraphy
Taxa
taxonomy
Western Europe
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Twenty-seven graptolite species are reported from the lowermost Silurian (Rhuddanian) ascensus-acuminatus and vesiculosus biozones of Montagne Noire in southwestern France. Four species are left in open nomenclature, four are new: Normalograptus crassus, Neodiplograptus lautus, Dimorphograptus compactus and Huttagraptus solidus. The joint occurrence of Akidograptus ascensus, Parakidograptus acuminatus and Cystograptus ancestralis, recorded in the Gabian-1 section, suggests correlation of the whole succession at this site with the middle part of a combined ascensus-acuminatus Biozone. Revision of museum collections revealed that other elements that are characteristic of the ascensus-acuminatus Biozone assemblage in peri-Gondwanan Europe, such as Normalograptus trifilis, N. longifilis and Neodiplograptus lanceolatus, have been recovered from several other localities in Montagne Noire that are no longer accessible. The graptolite assemblage of the Gabian-2 section, with common Cystograptus vesiculosus, Dimorphograptus extenuatus, D. elongatus and Atavograptus atavus, belongs to the lower part of the vesiculosus Biozone, whilst the appearance of D. swanstoni and D.? physophora in the upper part of the section represents a higher, although not the uppermost, part of the biozone. This is the first record of a diverse dimorphograptid fauna within the vesiculosus Biozone in the Gondwanan part of Europe.
ISSN:0022-3360
1937-2337
DOI:10.1666/07-004.1