| Computer Code: |
CMBE |
Preferred Map Code: |
notEntered |
| Status Code: |
Pending Upgrade |
| Age range: |
Quaternary Period (Q)
— Quaternary Period (Q) |
| Lithological Description: |
Chalk gravel in a fine-grained chalk clay matrix, with flint pebbles; commonly overlain by a metre of pale brown silty chalky loam; waterlain. [Generic description: 1:50 k map margins].
A terrace deposit of the Sudbury Formation (SBRY) in the Valley of the Upper Thames upstream of Oxford. It is now recognised as youngest unit of the Sudbury Formation (Sumbler, 2001) and by inference is equated with the Gerrards Cross Member (GCGR) of the Middle Thames area (see also Whiteman and Rose, 1992; Bridgland, 1994). |
| Definition of Lower Boundary: |
none recorded or not applicable
|
| Definition of Upper Boundary: |
none recorded or not applicable
|
| Thickness: |
none recorded or not applicable
|
| Geographical Limits: |
Valley of the Upper Thames upstream of Oxford. |
| Parent Unit: |
Sudbury Formation (SBRY)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Combe [SP 410 163]. |
| Reference(s): |
| 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. |
| Arkell, W J. 1947. The Geology of Oxford. 267pp. (Oxford: Clarendon Press.) |
| Arkell, W J. 1947. The geology of Evenlode Gorge, Oxfordshire. Proceedings of the Geologists' Association, Vol. 58, 87-113. |
| Bridgland, D R. 1994. Quaternary of the Thames. Geological Conservation Review Series No.7. (Peterborough: Joint Nature Conservation Committee.) |
| Sumbler, M G. 2001. The Moreton Drift, a further clue to glacial chronology in central England. Proceedings of the Geologists' Association, Vol.112, 13-27. |
| Whiteman, C A and Rose, J. 1992. Thames river sediments of the British Early and Middle Pleistocene. Quarterly Science Reviews, Vol.11, 363-375. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E217
|
