The BGS Lexicon of Named Rock Units — Result Details
Eype Clay Member
Computer Code: | EYCL | Preferred Map Code: | EyCl |
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Status Code: | Full | ||
Age range: | Pliensbachian Age (JE) — Pliensbachian Age (JE) | ||
Lithological Description: | Pale grey, micaceous, variably silty mudstone with many small siderite nodules. At base, Three Tiers Sandstone, c.7m thick, consisting of three units each 0.5 to 1m thick of very fine-grained sandstone, separated by sandy shale. | ||
Definition of Lower Boundary: | Base of Three Tiers Sandstone. Sharp boundary on mudstone of Green Ammonite Member. | ||
Definition of Upper Boundary: | Base of Starfish Bed (Downcliff Sand Member). | ||
Thickness: | 60m | ||
Geographical Limits: | Southwest Dorset. Mapped on Sheet 327 (Bridport). Northern limit not yet proved. | ||
Parent Unit: | Dyrham Formation (DYS) | ||
Previous Name(s): | Blue Clays [Obsolete Name and Code: Use EYCL]
(-239)
Eype Clay [Obsolete Name and Code: Use EYCL] (-240) Margaritatus Marls [Obsolete Name and Code: Use EYCL] (-3394) Micaceous Beds [Obsolete Name and Code: Use EYCL] (-3395) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | Seacliffs between Seatown and Eype Mouth, Dorset. Howarth, M K, 1957. | ||
Reference(s): | |||
Arkell, W J. 1933. The Jurassic System in Great Britain [Oxford: Clarendon Press.] | |||
Howarth, M K, 1957. The Middle Lias of the Dorset coast. Quarterly Journal of the Geological Society of London, Vol.113, 185-204. | |||
Day, E C H, 1863. On the Middle and Upper Lias of the Dorsetshire Coast. Quarterly Journal of the Geological Society of London, Vol.19, 278-297. | |||
Lang, W D, 1913. The lower Pleinsbachian - 'Carixian' - of Charmouth. Geological Magazine, Vol.10, 401-412. | |||
Woodward, H B, 1893. The Jurassic rocks of Britain. 3. The Lias of England and Wales (Yorkshire excepted). Memoir of the Geological Survey of Great Britain. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E327 E343 E326 |