| Computer Code: |
CLSA |
Preferred Map Code: |
ClSa |
| Status Code: |
Index Level |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
[Obsolete: use DROY]
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. Boundary with (Clava) Shelly Clay 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: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Hypostratotype (Section III of Peacock, 1975). River cliff section of Cassie Burn. Section NH74SE E9 on 'standard' map. |
| 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. |
| 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. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S084
|
