The BGS Lexicon of Named Rock Units — Result Details

Longhaugh Sand And Gravel Member

Computer Code: LUGH Preferred Map Code: LUGH
Status Code: Full
Age range: Holocene Epoch (QH) — Holocene Epoch (QH)
Lithological Description: The Member consists mainly of grey, loose, fine- to medium-grained, locally silty sand containing some comminuted shell debris. Gravel with shells is recorded below the sand units in the Longhaugh 20 Borehole [NS 4291 7319].
Definition of Lower Boundary: The Longhaugh Sand and Gravel Member of the Clydebank Clay Formation rests with angular unconformity on older Quaternary sediments or on bedrock. It most commonly rests on the Wilderness Till Formation (WITI) of the Caledonia Glacigenic Group (Midland Valley Glacigenic Subgroup).
Definition of Upper Boundary: The Longhaugh Sand and Gravel Member of the Clydebank Clay Formation is overlain by younger Quaternary sediments belonging to the same Formation.
Thickness: Veneer to more than 15m.
Geographical Limits: The Longhaugh Sand and Gravel Member of the Clydebank Clay Formation is recognised in the lower Clyde in the estuary of the Clyde around Longhaugh.
Parent Unit: Clydebank Clay Formation (CBCL)
Previous Name(s): Longhaugh Formation (-381)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Lower Clyde valley and Clyde estuary. Browne and McMillan (1989a). 
Reference Section  Longhaugh No.20 Borehole. Browne and McMillan (1989a), p.36. 
Reference(s):
Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. 
Browne, M A E and McMillan, A A. 1989a. Quaternary geology of the Clyde valley. British Geological Survey Research Report, SA/89/1. 
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. 
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. 
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). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable