The BGS Lexicon of Named Rock Units — Result Details
Saltford Shale Member
| Computer Code: | SASH | Preferred Map Code: | SaSh |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Rhaetian Age (TR) — Hettangian Age (JH) | ||
| Lithological Description: | Mostly grey, fissile or blocky, fossiliferous calcareous mudstones; a few limestones. | ||
| Definition of Lower Boundary: | Placed at the base of mudstones resting on the highest limestone of the underlying Wilmcote Limestone. Placed at top of Bed 26 at type section (Donovan, 1956). | ||
| Definition of Upper Boundary: | Placed at the base of an interbedded argillaceous limestone ('cementstone') and mudstone sequence. At base of Bed 22 at type section. (Donovan, 1956). | ||
| Thickness: | 4.27m at type section, 20-30m over most of Midlands. | ||
| Geographical Limits: | Central and southern Midlands. | ||
| Parent Unit: | Blue Lias Formation (BLI) | ||
| Previous Name(s): | Psiloceras Shales [Obsolete Name and Code: Use SASH]
(-4871)
Angulata Beds [Obsolete Name and Code: Use SASH] (-2408) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Section at Saltford railway cutting southeast of Keynsham, Somerset (Donovan, 1956, p.182-212). | ||
| Reference Section | BGS Twyning Borehole, 82.25 to 114.80m depth. | ||
| Reference Section | BGS Stowell Park Borehole, 1932' 0" to 2028' 6" depth. | ||
| Reference(s): | |||
| Old R A, Hamblin, R J O, Ambrose, K, and Warrington G. 1991. Geology of the country around Redditch. Memoir of the British Geological Survey, Sheet 183 (England and Wales). | |||
| Donovan, D T. 1956. The zonal stratigraphy of the Blue Lias around Keynsham, Somerset. Proceedings of the Geologists' Association, Vol.66, p. 182-212. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E183 E169 E199 E264 | |||