The earliest turrilepadid: a machaeridian from the Lower Ordovician of the Northwest Highlands
Authors: Herringshaw, Liam G.1; Raine, Robert J.2
Source: Scottish Journal of Geology, Volume 43, Number 2, 2007 , pp. 97-100(4)
Publisher: Geological Society Publishing House
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Abstract:
SynopsisA machaeridian sclerite from a thrombolite bed in the Sangomore Formation (Durness Group: Tremadoc) is the first to be described from NW Scotland. The large size, thickness and coarsely spaced rugae indicate the sclerite is that of a turrilepadid, but its morphology is distinct from any taxon described previously. Lacking a longitudinal fold and with three major inflections present along the accreting margin, it is interpreted as an outer right sclerite. It is the oldest turrilepadid yet recorded and shows that all three major groups of the problematical Machaeridia were present in the early Ordovician.Document Type: Miscellaneous
DOI: 10.1144/0036-9276/01-336
Affiliations: 1: Geology & Petroleum Geology, University of Aberdeen, Meston Building, King's College, Aberdeen, AB24 3UE, UK (l.herringshaw@abdn.ac.uk), Email: l.herringshaw@abdn.ac.uk 2: Lapworth Museum of Geology, School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK (RJR873@bham.ac.uk), Email: RJR873@bham.ac.uk
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