| Computer Code: |
LNGR |
Preferred Map Code: |
LG |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
A cobble gravel with a little sand and clay, and sparse shell fragments. |
| Definition of Lower Boundary: |
An undulating, channelled and erosional unconformable contact with the underlying clayey silt and fine-grained sand of the Kessock Bridge Silt Formation. |
| Definition of Upper Boundary: |
The present ground surface or a sharp, generally planar, erosional and unconformable contact with the overlying Flandrian raised beach deposits. |
| Thickness: |
About 30m |
| Geographical Limits: |
The area around the Inner Moray Firth and Beauly Firth, Inverness. Sheet S87W (Fortrose). |
| Parent Unit: |
Northern Highlands and Argyll Catchments Subgroup (NHC)
|
| Previous Name(s): |
Low Level Gravel of Inverness [Obsolete Name and Code: Use LNGR]
(-3535)
|
| Alternative Name(s): |
Longman Terrace
|
| Stratotypes: |
| Type Section |
Site investigation boreholes (570 L3-11 and M1-6) drilled along the line of the Kessock Bridge, Inverness,and registered by BGS as: NH64SW/16839 & NH64NW/17718 suffix 1 to 7, plus a second set which are currently misplaced. Peacock, J D and Wilkinson, IP in Merrit et al. 1995. |
| Reference(s): |
| Merrit, J W, Auton, C A, and Firth. C R. 1995. Ice-proximal glaciomarine sedimentation and sea-level change in the Inverness area, Scotland: A review of the deglaciation of a major ice stream of the British Late Devensian ice sheet. Quaternary Science Reviews, Vol.14, 289-329. |
| Sissons, J B. 1981. Late glacial marine erosion and a jokulhaup deposit in the Beauly Firth. Scottish Journal of Geology, Vol.17, 7-19. |
| Peacock, J D. 1977. Subsurface deposits of Inverness and the Inner Cromarty Firth. 103-104 in Gill, G (editor), Moray Firth Area Geological Studues. [Inverness Field Club]. |
| Fletcher, T P et al. 1996. Geology of the Fortrose and eastern Inverness district. Memoir of the British Geological Survey, Sheet 84W (Scotland). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S084
|
