The BGS Lexicon of Named Rock Units — Result Details

Clava Shelly Clay Member [Obsolete: use CLOCL]

Computer Code: CSCL Preferred Map Code: CSCl
Status Code: Index Level
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: [Obsolete: use CLOCL] Silty clay with sparse well rounded, high sphericity pebbles of psammite and quartzite, containing in situ high-boreal shells/microfauna.
Definition of Lower Boundary: Sharp, unconformable contact with Drummore Gravel below.
Definition of Upper Boundary: Gradational, generally marked by colour change, olive-grey to pale yellowish-brown (Clava Sand Member) above.
Thickness: 4.9 at type section.
Geographical Limits: Sheet NH74SE
Parent Unit: none recorded or not applicable
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Lectostratotype (after Horne et al, 1894; combined ' Main Pit' section and boreholes 1 and 3). River cliff section of Cassie Burn. Section NH74SE E5 on 'standard' map. 
Reference(s):
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. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable