| Computer Code: |
MUND |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Quaternary Period (Q)
— Quaternary Period (Q) |
| Lithological Description: |
Sand and flint gravel of marine origin. This unit has a lower frequency of far travelled material and an absence of distinctive far-travelled lithologies other than Triassic quartzose rocks and Carboniferous, Rhaxella and Greensand cherts. The lack of far-travelled materila probably reflects the distance of the mouth of the contemporary Thames from the coastal zone, and also local erosion by tributaries of the major rivers. |
| Definition of Lower Boundary: |
Locally, unconformable on Cromer Forest-bed Formation, elsewhere unknown. |
| Definition of Upper Boundary: |
Overlain unconformably by glacigenic deposits of the Sheringham Cliffs Formation with distinct change in lithology to sands and sandy, chalky tills. |
| Thickness: |
Probably up to c. 10 m, but little information available due to lack of clast lithological analysis. |
| Geographical Limits: |
Restricted to north-east East Anglia, but exact limits unknown. Not depicted on BGS maps as a separate member because of a lack of clast lithological data, but included in Crag Group. |
| Parent Unit: |
Wroxham Crag Formation (WRCG)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| West, R G. 1980. The Pre-Glacial Pleistocene of the Norfolk and Suffolk coasts. [Cambridge: Cambridge University Press.] |
| Rose, J, Moorlock, B S P and Hamblin, R J O. 2001. Pre-Anglian fluvial and coastal deposits in Eastern England: lithostratigraphy and palaeoenvironments. Quaternary International, 79, 5-22. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
