| Computer Code: |
HATI |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Mid Pleistocene (QPM)
— Mid Pleistocene (QPM) |
| Lithological Description: |
Brown silty sandy clay diamicton incorporating masses up to at least 100m across of "marly drift". The brown diamicton is apparently massive and contains much flint, quartz and quartzite, sediments of Cretaceous, Jurassic, Permo-Triassic, Carboniferous and Devonian derivation, and igneous erratics "marly drift" is pale grey or buff massive highly consolidated diamicton consisting almost entirely of re-constituted chalk and black hearted fresh flints, with minor Jurassic input. The Hanworth Member contrasts with other sandy tills of the Sheringham Cliffs Formation in that it is not contorted. |
| Definition of Lower Boundary: |
Rests unconformably on earlier Middle Pleistocene strata. Rests upon Lowestoft Formation at Lower Street [TG 16 34] and Alby Hill [TG 19 34]. Rests upon Corton Sand at Suffield [TG 23 31] and Buxton [TG 21 23]. Rests upon Happisburgh Till at Erpingham [TG 18 30]. West of Erpingham may cut through the Happisburgh Till to rest upon Wroxham Crag Formation. |
| Definition of Upper Boundary: |
Overlain unconformably by the Briton's Lane Sand and Gravel (Mid Pleistocene). |
| Thickness: |
To c.25m |
| Geographical Limits: |
Known from mapping and trial pits between Lower Street, Gallows Hill, and Buxton. Southward extent unknown as not yet mapped. Eastward extent unclear as it passes below the Briton's Lane Formation, may be cut out unconformably by it. Northward extent also unclear as it passes below the Briton's Lane Formation, but not cut out unconformably, passes into "contorted drift" members of the Sheringham Cliffs Formation. Westward extent unclear as the relationships of the Hanworth Member and the Lowestoft Formation have not been resolved, but Hanworth Member eventually passes into "marly drift" members of the Sheringham Cliffs Formation. |
| Parent Unit: |
Sheringham Cliffs Formation (SMCL)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
The area around Wickmere, Norfolk. |
| Reference(s): |
| Moorlock, B S P, Hamblin, R J O, Booth, S J, Kessler, H, Woods, M A and Hobbs, P R N. 2002. Geology of the Cromer district - a brief explanation of the geological map. Sheet explanation of the British Geological Survey. 1:50 000 Sheet 131 Cromer (England and Wales). |
| Hamblin, R J O. 2001. Geological notes and local details or 1: 10 000 Sheet TG 03 SE (Briston). British Geological Survey Technical Report WA/00/34. |
| Hamblin, R J O, Moorlock, B S P, Rose, J, Lee, J R, Riding, J B, Booth, S J and Pawley, S M. 2005. Revised Pre-Devensian glacial stratigraphy in Norfolk, England, based on mapping and till provenance. Netherlands Journal of Geoscience, Vol.84, 77-85. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E131
E147
|
