| Computer Code: |
WVRVA |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Holocene Epoch (QH) |
| Lithological Description: |
Probably silt, sand and clay alluvial deposits grading to gravel at base. River Terraces are composed of gravel or gravelly 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: |
Ground surface or unconformable below artificial deposits. |
| Thickness: |
Highly variable depending on the relative stratigraphical positions of each of the component units. In the major river valley the thickness may vary from between 2 and 5m, but probably does not exceed 10m. |
| Geographical Limits: |
Cheshire within the river valley and tributaries of the River Weaver. |
| Parent Unit: |
Cheshire - North Wales Catchments Subgroup (CNWCA)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Alluvium and River Terrace deposits of the river valley and tributary valleys of the River Weaver. Thomas in Bowen (1999), 95. |
| Reference(s): |
| 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. |
| 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. |
| Johnson, R H. 1969. A Reconnaissance Survey of some River Terraces in parts of the Mersey and Weaver Catchments. Manchester Literary and Philosophical Society (Memoirs and Proceedings), Vol.112, 1969-1970. |
| Evans, W B, Wilson, A A, Taylor, B J and Price, D. 1968. Geology of the country around Macclesfield, Congleton, Crewe and Middlewich. Memoir of the Geological Survey of Great Britain, Sheet 110 (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
