Silurian graptolite biostratigraphy of the Röstånga-1 drill core, Scania – a standard for southern Scandinavia

Abstract

The Röstånga-1 core from west-central Scania provides the most complete succession of the Sandbian (Upper Ordovician) through lower Telychian (Silurian, Llandovery) strata of southern Scandinavia. The Hirnantian is identified in the Kallholn Formation by the presence of a Metabolograptus persculptus Biozone fauna. The Akidograptus ascensus, Parakidograptus acuminatus, Cystograptus vesiculosus and Monograptus revolutus biozones can be differentiated in the Rhuddanian. Following a considerable gap (Demirastrites triangulatus Biozone to a level within the Pribylograptus leptotheca Biozone), the succession resumes. The Aeronian also includes the Lituigraptus convolutus and Stimulograptus sedgwickii biozones. The Stimulograptus halli Biozone appears to be missing, but the Telychian Spirograptus guerichi to Streptograptus crispus biozones have been recognized.

Keywords::

• Graptolites
• biostratigraphy
• Ordovician
• Silurian
• Scania
• Sweden

Acknowledgements

The manuscript is in part based on the notes left by the late Tatyana Koren' (St Petersburg, Russia), who provided the initial identification of the faunas and, thus, the basis for the biostratigraphy of the Röstånga-1 drill core. Most of her investigation of the material from the Röstånga drill core has not been published. Per Ahlberg and Jörg Maletz are indebted to the Wenner-Gren Foundations and Gyllenstiernska Krapperupstiftelsen for financial support.