David K. Loydell (1) and Lennart Jeppsson (2)
Graptolites from the Lower and Upper Visby formations of NW Gotland

Keywords
Silurian, Llandovery, Wenlock, graptolites, conodonts, Ireviken Event, Gotland, Sweden

Abstract
Graptolites are uncommon in the Lower Visby Formation. Specimens derived from conodont residues are predominantly members of the long ranging genus Retiolites, with single specimens recorded of Paraplectograptus and Monograptus priodon. Only one graptolite, a specimen of Cyrtograptus bohemicus, has been recovered from the Upper Visby Formation. This is the only biostratigraphically important species in the collection: it has a range of murchisoni Biozone to lower riccartonensis Biozone.

Author info
1) School of Earth and Environmental Sciences, University of Portsmouth, Burnaby Road, Portsmouth PO1 3QL, UK; David.Loydell@port.ac.uk 2) Department of Geology, GeoBiosphere Science Centre, Lund University, Sölvegaten 12, S-223 62 Lund, Sweden; lennart.jeppsson@geol.lu.se

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