| Computer Code: |
GLVA |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Wolstonian Stage (QO)
— Devensian Stage (QD) |
| Lithological Description: |
Sand and gravel, interpreted as terrace deposits, or silty clay interpreted as alluvium deposits. |
| Definition of Lower Boundary: |
Generally where the fluvial deposits rest on bedrock or older superficial deposits. |
| Definition of Upper Boundary: |
Present day river terrace or upper surface of alluvium. |
| Thickness: |
Variable, up to 5 m. |
| Geographical Limits: |
The formation consists of fluviatile members related to a river draining the present valleys of the Leadon and its tributaries, including the Glynch, Ell and Moor End brooks in Gloucestershire and Worcestershire. |
| Parent Unit: |
Severn and Avon Catchments Subgroup (SACA)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
The valley of the River Leadon and its tributaries, including the Glynch, Ell and Moor End Brooks, Gloucestershire and Worcestershire. |
| 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. |
| Worssam, B C, Ellison, R A and Moorlock, B S P. 1989. Geology of the country around Tewkesbury. Memoir of the British Geological Survey, Sheet 216 (England and Wales). |
| Maddy, D. 1999. English Midlands Chapter 3 in Bowen, D Q (Editor), A revised correlation of the Quaternary deposits in the British Isles. Geological Society Special Report, No.23. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
