| Computer Code: |
LGGR |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Partially cemented gravel typically containing a high (50-60%) proportion of locally derived limestone and dolomite pebbles of the Zechstein Group (formerly Magnesian Limestone) and a varied suite of far-travelled clasts including Carboniferous lithologies, andesite, granite, gneisse, schist, flint, quartz, quatzite and dolerite, together with unabraded shell fragments. |
| Definition of Lower Boundary: |
Unconformable, erosional, channelled contact with limestones and dolostones of the Zechstein Group (formerly Magnesian Limestone). |
| Definition of Upper Boundary: |
Generally a sharp, subhorizontal, planar to gently undulating contact with dark grey, stiff, sandy silty stony clay diamicton of the Blackhall Till Formation. |
| Thickness: |
Up to 6m known |
| Geographical Limits: |
Coast of County Durham. |
| Parent Unit: |
North Sea Coast Glacigenic Subgroup (NSG)
|
| Previous Name(s): |
Lower Gravels [Obsolete Name and Code: Use LGGR]
(-1023)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Cliff section 490m south of Horden Point. |
| Reference(s): |
| Smith, D B and Francis, E A. 1967. Geology of the country between Durham and West Hartlepool. Memoir of the Geological Survey of Great Britain, Sheet 27 (England and Wales). |
| Francis, E A. 1970. Quaternary. 134-152 in Johnson, G A L, Geology of Durham County. [Newcastle: Natural History Society of Northumberland, Durham and Newcastle-upon-Tyne.] 152pp. |
| Bridgland, D R, Horton, B P, and Innes, J B. 1999. The Quaternary of northeast England. Field Guide. Quaternary Research Assocation, London. |
| Thomas, G S P. 1999. Northern England. 91-98 in Bowen, D Q (Editor), A revised correlation of Quaternary and Neogene deposits in the British Isles. Geological Society Special Report No.23. |
| Huddart, D. 2002. Warren House Gill. 51-56 in Huddart, D and Glasser, N F (editors), Quaternary of Northern England. Geological Conservation Review Series, No.25. [Peterborough: Joint Nature Conservation Committee.] 745pp. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
