The BGS Lexicon of Named Rock Units — Result Details

Dalroy Sand Member

Computer Code: DROY Preferred Map Code: DLS
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Silty fine- to medium-grained, micaceous sand, containing graded beds and sparse drop-stones. Typically glacitectonised.
Definition of Lower Boundary: Gradational, at colour change, (pale yellowish brown to olive grey) with Clava Lodge Clay Member, or glacitectonic boundary with Culdoich Till Member.
Definition of Upper Boundary: Sharp, unconformable, glacitectonic boundary with Finglack Till Formation.
Thickness: 6.1m at type section, 4.2m at section NH74SE E9
Geographical Limits: Sheet NH74SE.
Parent Unit: Clava Shelly Formation (CLSH)
Previous Name(s): Clava Sand Member [Obsolete Name And Code: Use DROY] (CLSA)
Alternative Name(s): none recorded or not applicable
Reference Section  Lectostratotype (Peacock, 1975). (Dalroy Sand and Culdoich Till members only). River cliff section of Cassie Burn. Section NH74SE E9 on 'standard' map. 
Type Section  Lectostratotype (Horne et al, 1894;'Main Pit'), type section and borehole information. Established informally in Merritt (1990). Section in former clay pit by Cassie Burn; boreholes (1) and (3) of Horne et al, (1894). Section NH74SE E5 'standard' map. 
Merritt, J W 1992. The high-level marine shell-bearing deposits of Clava, Inverness-shire, and their origin as glacial rafts. Quaternary Science Reviews, Vol.11, 759-777. 
Fletcher, T P et al. 1996. Geology of the Fortrose and eastern Inverness district. Memoir of the British Geological Survey, Sheet 84W (Scotland). 
Horne, J and others, 1894. The character of the high-level shell-bearing deposits at Clava, Chapelhall and other localities. Report of the British Association for the Advancement of Science for 1883, p.483-514. 
Peacock, J D, 1975. Depositional environment of glacial deposits at Clava, north-east Scotland. Bulletin of the Geological Survey of Great Britain, No.49. 31-37. 
Merritt, J W, 1990. The lithostratigraphy at Clava, Inverness-shire and a new model for the origin of its shell-bearing deposits as glacially-transported allochthons. "In" Auton, C A, Firth, C R and Merritt, J W. (Editors). Beauly to Nairn: Field Guide. Quaternary Research Association, Cambridge. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: