Cumbrian Coast GroupName
95116Province: North and east Irish Sea and bordering land areas west of the Pennines including west Cumbria, Vale of Eden, south Cumbria, Lancashire and north-east Cheshire, ie the 'Bakevellia Sea Basin' of Smith and others (1974); see also Jackson and others, 1987.
Geologic Age: Permian Period
Other: Calcareous sandstone, dolostone, halite, non-carbonate salt-rock, siltstone and silty mudstone with subsidiary mudstone and sandstone. Stratified bedrock. Occurs both onshore and offshore. Deposited during the Permian Period (298.9-252.2 Ma BP). Comprises a basal sequence of grey siltstones and dolomites overlain by evaporites (St Bees Evaporite Formation), overlain by red siltstones, silty mudstones and calcareous sandstones (St Bees Shale Formation), which locally pass laterally into halite. Ranges from 36m in type section to 300m+ in Irish Sea grabens. Point in sequence where there is a sharp upwards change from either Brockram or red sandstone, to grey siltstones or dolomites. Tends to be gradational therefore taken arbitrarily where sandstone (St Bees Sandstone Formation) becomes predominent over siltstone (St Bees Shale Formation).
Usage: Current name
