| Computer Code: |
LITC |
Preferred Map Code: |
Lit |
| Status Code: |
Full |
| Age range: |
Oxfordian Age (JO)
— Oxfordian Age (JO) |
| Lithological Description: |
Interbedded, alternating micritic, shell-fragmented wackestone and packstone limestones, with dark grey mudstones and variable shell fragmented marls, commonly containing Nanogyra nana. |
| Definition of Lower Boundary: |
Non-sequential upward change from sand or sandstone of the Beckley Sand Member of the Kingston Formation, to limestone and mudstone generally poor in quartz sands. |
| Definition of Upper Boundary: |
Upward change to grey, more uniform and locally slightly sparsely shell-detrital mudstones of the Ampthill Clay Formation. |
| Thickness: |
Up to about 12 m thick. |
| Geographical Limits: |
Kennington, Littlemore and Garsington, south and south-east of Oxford. The 1:50 000 sheet 237 (inset map), shows the north-eastern limit as a passage into the Wheatley Limestone or Oakley members. The southern and western extents are uncertain, but are believed to be restricted to the area above, beyond which it passes into the Wheatley Limestone or equivalent limestone facies (see Arkell, 1927; 1933). |
| Parent Unit: |
Stanford Formation (STFD)
|
| Previous Name(s): |
Littlemore Clay Beds [Obsolete Name and Code: Use LITC]
(-365)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Littlemore railway cutting. Pringle, 1926; Horton et al, 1995. |
| Reference Section |
BGS Garsington No. 1 Borehole (SP50SE/49), 10.31 - 21.60 m depth. Horton et al, 1995. |
| Reference(s): |
| Arkell, W J. 1933. The Jurassic System in Great Britain (Oxford: Clarendon Press.) |
| Cox, B M, and Wright, J K. 2001. British Upper Jurassic stratigraphy (Oxfordian to Kimmeridgian). Geological Conservation Review Series, No. 21. (Peterborough: Joint Nature Conservation Committee.) |
| Wright, J K and Cope, J C W. In press. Oxfordian - Kimmeridgian Correlation Chart. In: A correlation of Jurassic rocks in the British Isles: Middle and Upper Jurassic. Cope, J C W (editor). Special Report of the Geological Society of London. |
| Arkell, W J. 1927. The Corallian rocks of Oxford, Berkshire and north Wiltshire. Philosophical Transactions of the Royal Society of London, Vol. B216, 67-181. |
| Horton, A, Sumbler, M G, Cox, B M and Ambrose, K, 1995. Geology of the country around Thame. Memoir of the British Geological Survey, Sheet 237 (England and Wales). |
| Pringle, J. 1926. The geology of the country around Oxford, (2nd edition). Memoir of the Geological Survey of Great Britain. |
| Arkell, W J. 1947. The Geology of Oxford. 267pp. (Oxford: Clarendon Press.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E237
E236
E253
|
