The BGS Lexicon of Named Rock Units — Result Details
California Till Member
| Computer Code: | CATI | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Pleistocene Epoch (QP) — Pleistocene Epoch (QP) | ||
| Lithological Description: | The California Till Member consists of a stratified matrix-supported diamicton that comprises beds of massive brown sandy diamicton, separated by beds of massive and horizontal-bedded chalky sand with sporadic augen-shaped lenses of fine silty sand. It is similar in lithology to the Corton Till Member. | ||
| Definition of Lower Boundary: | The California Till Member overlies the Corton Sand Member within the Scratby and California area. The contact between the two units is gradational. | ||
| Definition of Upper Boundary: | The upper boundary of the California Till Member is typically scoured and erosional, and is overlain by chalky outwash and till deposits of the Lowestoft Formation. | ||
| Thickness: | Maximum observed thickness of 13m at California Gap. | ||
| Geographical Limits: | The California Till Member has been logged in cliff sections between California Gap and Scratby to the north of Great Yarmouth, and occurs as separate mappable leaves of till inland in the Great Yarmouth and North Walsham districts. | ||
| Parent Unit: | Happisburgh Glacigenic Formation (HPGL) | ||
| Previous Name(s): | Norwich Brickearth [Obsolete Name And Code: See CATI]
(NBE)
Corton Till [Obsolete Name and Code: Use CATI] (-3276) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Cliff sections northwest of California Gap, south Norfolk. At this locality, approximately 4m of the California Till Member can be seen resting upon the Corton Sand Member and truncated in turn by the Lowestoft Till Member. The till at this locality is highly stratified, consisting of beds of diamicton and sorted sand. Arthuton et al., 1994. | ||
| Reference(s): | |||
| Arthurton, R S, Booth, S J, Morigi, A N, Abbott, M A W, and Wood, C J. 1994. Geology of the country around Great Yarmouth, Sheet Memoir 162, British Geological Survey. [London: HMSO.] 138pp. | |||
| Lunkka, J P. 1994. Sedimentation and lithostratigraphy of the North Sea Drift and Lowestoft Till Formations in the coastal cliffs of northeast Norfolk, England. Journal of Quaternary Science, Vol. 9, 203-233. | |||
| Lee, J R, Booth, S J, Hamblin, R J O, Jarrow, A M, Kessler, H, Moorlock, B S P, Morigi, A N, Palmer, A, Riding, J B and Rose, J. 2004. A new stratigraphy for the glacial deposits around Lowestoft, Great Yarmouth, North Walsingham and Cromer, East Anglia, UK. Bulletin of the Geological Society of Norfolk, Vol.53, 3-60. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||