Non-marine Tertiary sediments of western Britain and Ireland
2016. "Non-marine Tertiary sediments of western Britain and Ireland", A revised correlation of Tertiary rocks in the British Isles and adjacent areas of NW Europe, C. King, A. S. Gale, T. L. Barry
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Almost 20 basins filled by largely or wholly non-marine Paleogene sediments have been identi?ed in a roughly north-south zone extending from the Bovey Basin in south Devon to the Little Minch Basin in the Hebrides (Figs 42 & 165). The largest onshore basin is the Lough Neagh Basin, in Northern Ireland (c. 500 km2). Almost all are fault-controlled extensional basins. Many are half-graben, some are pull-apart basins adjacent to strike-slip faults. The best-documented of these faults is the Sticklepath-Lustleigh Fault, a reactivated Variscan fault zone at least 200 km long. Most basins have an initial fill of coarse clastic alluvial fan and fluvial sediments, which fine upwards to alluvial and lacustrine clays, often with thick lignites. The Paleogene fill unconformably overlies Mesozoic or older rocks. In basins in the SW of this area (e.g. Stanley Bank Basin, South Celtic Sea Basin), records of glauconite and dinoflagellates indicate marine in?uence at some levels, reflecting proximity to the North Atlantic.