Upper Ordovician gastropods of the Fågelsang area, Southern Sweden
2009 (English)In: Lundadagarna i Historisk Geologi och paleontology XI, 11-12 March, 2009, Abstracts with programme, 2009, 12- p.Conference paper (Other academic)
The Ordovician succession of the Fågelsång area in southern Sweden is classical geology embodied. A deeper water setting and graptolitic mudstones and shales has allowed an almost unprecedented level of stratigraphical detail. Moreover, with the establishment of the international stratotype (GSSP) for the Sandbian Stage, marking the base of the Upper Ordovician, the sections here now serve as global references. The present project documents for the first time the diverse tergomyan and gastropod fauna in the Upper Ordovician of the Fågelsång area. Altogether 13 species are described, including two tergomyan species, five bellerophontoid gastropods and sixanisostrophic ally coiled gastropods. The specimens come from both outcrop and drill core collections, spanning the Sularp Shale through the Lindegård Mudstone (Nemagraptus gracilis to the Dicellograptus complanatus graptolite zones; Sandbian-Katian stages, Viru-Harju regional stages). Three taxa (e.g. Tritonophon, Tetranota and Haplospira?) are found in the youngest strata - the Lindegård mudstone, while the remaining forms are from the deeper facies of the Sularp, Skagen, and Mossen formations. Many of the taxa may have been transported into the area from shallower settings, and only Sinuites may have been part of the local benthic community. Besides the taphonomy, the fauna recorded is interesting from both a taxonomic and palaeobiogeographic point of view. However, the emphasis in this presentation is on the latter aspect. With the exception of Bucania, Haplospira, and Deaechospira, no other taxa are common to the hitherto described gastropod fauna of the coeval Dalby Limestone in other parts of Sweden. The Fågelsång fauna have more in common with the slightly older and coeval fauna of the Elnes to Arnestad formations in the Oslo Region (e.g. Joleaudella, Sinuites, Mesteronema, Pararaphistoma), but significant similarities with peri-Gondwanan faunas are also evident (e.g. Peelerophon, Cyrtodiscus, Tritonophon). Both Peelerophon and Cyrtodiscus are for the first time recorded in Baltoscandia while the Fågelsång Tritonophon is stratigraphically the oldest in Baltoscandia.
Place, publisher, year, edition, pages
2009. 12- p.
IdentifiersURN: urn:nbn:se:uu:diva-111362OAI: oai:DiVA.org:uu-111362DiVA: diva2:280795