The BGS Lexicon of Named Rock Units — Result Details
Happisburgh Till Member
| Computer Code: | HPTI | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Pleistocene Epoch (QP) — Pleistocene Epoch (QP) | ||
| Lithological Description: | The Happisburgh Till Member is a yellowish grey to grey matrix-supported diamicton that has a sandy clay matrix texture. The clast content of the diamicton is <1% and composed predominantly of flint, vein quartz and quartzite with a subsidiary assemblage of far-travelled British erratic lithologies including Carboniferous limestone, Carboniferous coal, Devonian Red Sandstone, Permian Red Sandstone, Permian "Magnesian" limestone, felsic and basaltic porphyry, Dalradian metasediments. The diamicton has been interpreted as a subglacial deformation till. | ||
| Definition of Lower Boundary: | The basal contact between the Happisburgh Till Member and the underlying Wroxham Crag Formation is represented by an upward transition from tidally laminated sand and silt to till. | ||
| Definition of Upper Boundary: | The upper boundary of the Happisburgh Till Member is variable but generally consists of a series of ridges and troughs that have been interpreted as a range of subglacial and ice-marginal landforms. The till is overlain by a series of laminated clays (Ostend Clay Member) and sands (Happisburgh Sand Member). | ||
| Thickness: | Typically between 2 to 7m | ||
| Geographical Limits: | The Happisburgh Till Member can be observed in coastal sections between Happisburgh and Overstrand in northeast Norfolk. | ||
| Parent Unit: | Happisburgh Glacigenic Formation (HPGL) | ||
| Previous Name(s): | First Cromer Till
(-965)
Happisburgh Diamicton [Obsolete Name and Code: Use HPTI] (-3479) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Cliff sections 500m east of Happisburgh lighthouse, Happisburgh, Norfolk, showing the Happisburgh Till Member overlain by the Ostend Clay Member and Happisburgh Sand Member. Hart, 1999. | ||
| Reference(s): | |||
| 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. | |||
| Banham, P H. 1968. A preliminary note on the Pleistocene stratigraphy of northeast Norfolk. Proceedings of the Geologists' Association, Vol. 79, 507-512. | |||
| Hart, J K. 1999. Glacial sedimentation: a Casy Study from Happisburgh, Norfolk. In Jones, A P, Tucker, M E and Hart, J K (editors), The Description and Analysis of Quaternary Stratigraphic Field Sections. Technical Guide 7, Quaternary Research Association. | |||
| McMillan, A A, Hamblin, R J O, and Merritt, J W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report, RR/10/03. 343pp. | |||
| 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. | |||
| Ranson, C E. 1968. An assessment of the glacial deposits of northeast Norfolk. Bulletin of the Geological Society of Norfolk, Vol.16, 1-16. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E131 | |||