| Computer Code: |
URL |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Brigantian Substage (CX)
— Brigantian Substage (CX) |
| Lithological Description: |
[Obsolete: use AG] A rhythmic sequence of limestones, shales and mudstones, siltstones and sandstones, with seatearths and coals. |
| Definition of Lower Boundary: |
Drawn at the base of the Callant Limestone Formation where it rests conformably upon the Lower Liddesdale Group. |
| Definition of Upper Boundary: |
Drawn at the conformable upward passage from the Catsbit Limestone Formation of the Upper Liddesdale Group to the overlying Millstone Grit Group. |
| Thickness: |
c. 290 m. |
| Geographical Limits: |
Liddesdale, Dumfriesshire and Roxburghshire (now called the Borders Region). |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
Middle Limestone Group [Obsolete: use MLG]
|
| Stratotypes: |
| Type Area |
Liddesdale |
| Reference(s): |
| 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). |
| Day, J B W, and others. 1970. Geology of the neighbourhood around Bewcastle. Memoir of the British Geological Survey, Sheet 12. (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E020
|
