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
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Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
Middle Limestone Group [Obsolete: use MLG]
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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: |
E020
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