The BGS Lexicon of Named Rock Units — Result Details
Hayne Beech Member
| Computer Code: | HYBC | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Pending Upgrade | ||
| Age range: | Chadian Substage (CI) — Asbian Substage (CR) | ||
| Lithological Description: | Soft, light to dark grey, commonly pale weathering, siliceous radiolarian shaly mudstones, typically thin-bedded (c. 10 cm), interbedded with thin silicified limestone and chert beds and thin, mottled and dolomitized limestones at the top. | ||
| Definition of Lower Boundary: | The lower boundary is taken at the incoming of thin-bedded, light to dark grey siliceous radiolarian shaly mudstones and thin limestone beds above the hard, black, finely laminated cherty mudstones of the underlying Doddiscombe Formation. | ||
| Definition of Upper Boundary: | The upper boundary is taken at the incoming of abundant blocky chert with few limestones of the Kersdown Chert Member above the siliceous radiolarian shaly mudstones. | ||
| Thickness: | About 40 m | ||
| Geographical Limits: | Between Upcott, near Brushford (SS 90 25) and Tracebridge (ST 06 20), Somerset | ||
| Parent Unit: | Bampton Limestone Formation (BPLM) | ||
| Previous Name(s): | Hayne Beech Formation [Obsolete Name and Code: Use HYBC]
(-4108)
Hayne Beech Beds [Obsolete Name and Code: Use HYBC] (-3483) Lower Bampton Limestones [Obsolete Name and Code: Use HYBC, BPLM] (-3865) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | Kersdown quarry, Bampton, Somerset. The upper c. 40 m thickness of the member is seen in the core of an anticline, along with the lower boundary of the overlying Kersdown Chert Member. Described by Whiteley (2004). | ||
| Reference(s): | |||
| Whiteley, M J. 2004. Culm Trough. 477-504 in British Lower Carboniferous Stratigraphy. Cossey, P J, Adams,A E, Purnell, M A, Whiteley, M J, Whyte, M A and Wright, V P (editors). Geological Conservation Review Series, No 29. (Peterborough: Joint Nature Conservation Committee). | |||
| Thomas, J M. 1962. The Culm Measures in north-east Devon. Proceedings of the Ussher Society, Vol. 1, 29-30. | |||
| Webby, B D. and Thomas, J M. 1965. Whitsun field meeting: Devonian of west Somerset and the Carboniferous of north-east Devon. Proceedings of the Geologists Association, Vol. 76, 179-194. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||