| Computer Code: |
RIBV |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Holocene Epoch (QH) |
| Lithological Description: |
Silt, sand and clay in Alluvium grading into gravel at base. River Terraces are dominated by gravel grading upwards into silt and sand. |
| Definition of Lower Boundary: |
Probably unconformable, irregular and in places strongly incised into lithologically variable sediments of the Caledonia or Albion Glacigenic Groups or into bedrock. |
| Definition of Upper Boundary: |
At the ground surface or unconformable below artificial deposits. |
| Thickness: |
Generally less than 5m but locally up to 12m. |
| Geographical Limits: |
Lancashire and adjacent areas within the river valley and tributaries of the River Ribble. |
| Parent Unit: |
Cumbria-Lancashire Catchments Subgroup (CLCA)
|
| Previous Name(s): |
Fluvial parts of Swettenham and Lytham formations [Obsolete Name and Code: Use RIBV]
(-2393)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
The river valley and tributaries of the River Ribble. |
| Reference Section |
Whitbread Brewery Borehole, Preston, BGS Borehole Reference SD523NE/12. |
| Reference(s): |
| Price, D et al. 1963. Geology of the country around Preston. Memoir of the Geological Survey of Great Britain, Sheet 75 (England and Wales). |
| McMillan, A A, Hamblin, R J O and Merritt, J W. 2005. An overview of the lithostratigraphical framework for the Quarternary and Neogene deposits of Great Britain (onshore). British Geological Survey Research Report RR/04/04. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
