| Computer Code: |
LLDD |
Preferred Map Code: |
notEntered |
| Status Code: |
Index Level |
| Age range: |
Asbian Substage (CR)
— Asbian Substage (CR) |
| Lithological Description: |
[Duplicate: use LRL] An alternation of mainly marine shales and limestones with some thin coals and seatearths. |
| Definition of Lower Boundary: |
Drawn at the base of the Dinwoodie Member where it rests conformably upon the Lower Carboniferous rocks of the Upper Border Group. |
| Definition of Upper Boundary: |
Drawn at the base of the overlying Callant Limestone of the Upper Liddesdale Group. |
| Thickness: |
300 metres approx. |
| Geographical Limits: |
Liddesdale, Dumfriesshire and Roxburghshire. (Borders Region). |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Liddesdale. |
| Reference(s): |
| Day, J B W and others, 1970. Geology of the neighbourhood around Bewcastle. Memoir of the British Geological Survey, Sheet 12. (England and Wales). |
| Lumsden G I, Tulloch W, Howells M F and Davies A. 1967. The geology of the neighbourhood of Langholm. Memoir of the Geological Survey, Sheet 11 (Scotland). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
