The BGS Lexicon of Named Rock Units — Result Details

Walcott Till Member
Computer Code: WATI Preferred Map Code: notEntered
Status Code: Full
Age range: Anglian Age (QA) — Anglian Age (QA)
Lithological Description: The lower boundary of the Walcott Till Member consists of an olive grey to olive brown silt-rich matrix-supported diamicton that is largely massive in structure. It has a moderate matrix calcium carbonate content of c.36% and contains an abundance of chalk and flint clasts.
Definition of Lower Boundary: The lower boundary of the Walcott Till Member is irregular and erosional and lies upon either sandy Wroxham Crag Formation sediments or on laminated silts and clays of the Happisburgh Glacigenic Formation. Commonly these underlying sediments exhibit evidence of shearing. [See also the Stratotype information.]
Definition of Upper Boundary: The diamicton is generally overlain by the outwash sands of the Mundesley Sand Member. The junction between the two units is commonly sharp and erosional.
Thickness: A maximum of 2.2m has been observed.
Geographical Limits: Found in outcrops throughout the North Walsham and Cromer districts; occurs in coastal sections between Happisburgh and Overstrand, north Norfolk.
Parent Unit: Lowestoft Formation (LOFT)
Previous Name(s): Second Cromer Till (-4958)
Walcott Diamicton (-4959)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Ostend cliffs, north Norfolk. At this locality, the Walcott Till Member can be seen to overlie and truncate the Ostend Clay Member, which in turn, rests upon the Happisburgh Till Member. 
Reference(s):
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. 
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, 9, 209-233. 
Banham, P H. 1968. A preliminary note of the Pleistocene stratigraphy of northeast Norfolk. Proceedings of the Geologists' Association, Vol.79, 469-474. 
Hart, J K. 1987. The genesis of the northeast Norfolk Drift. Unpublished PhD thesis. University of East Anglia. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable
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