The BGS Lexicon of Named Rock Units — Result Details

Law Sand And Gravel Member

Computer Code: LAWSG Preferred Map Code: LAW
Status Code: Full
Age range: Holocene Epoch (QH) — Holocene Epoch (QH)
Lithological Description: Massive, flat laminated and also cross bedded grey, fine- to coarse-grained sand with silt and traces of fine gravel, locally loose to dense, dark brownish grey, framework-supported, sub-angular to rounded fine to medium gravel with sand. Bedded silt with thin peat units and organic layers are intercalated. In places the member may encompass an even wider range of grain sizes including coarse gravel, cobbles and boulders.
Definition of Lower Boundary: Unconformably on bedrock and many older Quaternary strata including the Wilderness Till Formation and Bellshill Clay Member at Law and conformably on the Lochwinnoch Clay Member at Lochwinnoch.
Definition of Upper Boundary: The Law Sand and Gravel Member passes insensibly downstream into the estuarine and marine deposits of the Gourock Sand and Erskine Clay members of the Clydebank Clay Formation. It is widely exposed at the surface.
Thickness: Veneer to more than 18m.
Geographical Limits: Alluvium of the catchment of the River Clyde including all tributaries.
Parent Unit: Clyde Valley Formation (CLVY)
Previous Name(s): Law Formation [Obsolete Name And Code: Use CLVY] (LAW)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Clyde valley catchment area. 
Reference(s):
Paterson, I B, McAdam, A D and MacPherson, K A T. 1998. Geology of the Hamilton district. Memoir of the British Geological Survey, Sheet 23W (Scotland). 
Browne, M A E and McMillan, A A. 1989b. Geology for land use planning: drift deposits of the Clyde valley Volume 1: Planning Report. British Geological Survey Technical Report, WA/89/78. 
Hall, I H S, Browne, M A E and Forsyth, I H. 1998. Geology of the Glasgow district. Memoir of the British Geological Survey, Sheet 30E (Scotland). 
Browne, M A E and McMillan, A A. 1989a. Quaternary geology of the Clyde valley. British Geological Survey Research Report, SA/89/1. 
Forsyth, I H, Hall, I H S and McMillan, A A. 1996. Geology of the Aidrie district. Memoir of the British Geological Survey, Sheet 31W (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable