The Lonfearn Member, Lealt Shale Formation, (Middle Jurassic) of the Inner Hebrides, Scotland
Posted on 2018-05-09 - 12:07
The Lonfearn Member, Lealt Shale Formation, is a distinctive unit within the Great Estuarine Croup Group in the Middle Jurassic of the Inner Hebrides, Scotland. Its dominant lithology of fine-grained, partly laminated mudstone marks it out as a time of minimum input of coarse clastic material into the Hebridean basin, when consistent facies extended over some 75km between north Skye and the Isle of Eigg. Inter-bedded with the mudstones are thin (decimetre) shelly and partly ferruginous and oolitic limestones, the combination giving a unique facies association in the British Bathonian. The predominantly low-salinity biota is dominated by the bivalve Neomiodon, ostracods and Spinicaudatans. Episodes of inferred higher salinity aid in correlating sections from the type locality in North Trotternish, Skye to other localities, principally Strathaird in south Skye and the Isle of Eigg. In this paper we describe the principal outcrops of the Lonfearn Member, drawing together existing accounts and contributing new data, especially on the type section, to provide a framework for future work.
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Hudson, John D.; Wakefield, Matthew I. (2018). The Lonfearn Member, Lealt Shale Formation, (Middle Jurassic) of the Inner Hebrides, Scotland. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.4093991.v1