| Computer Code: |
LBO |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Courceyan Substage (CF)
— Arundian Substage (CJ) |
| Lithological Description: |
[Obsolete: use BGN, LYNE] Interbedded sandstones, siltstones and mudstones with some limestones ('cementstones'); marine faunal bands in places; local volcanic units. |
| Definition of Lower Boundary: |
At base of Birrenswark Lavas which rest on Upper Old Red Sandstone. |
| Definition of Upper Boundary: |
At conformable base of Middle Border Group: at base of Harden Beds (Langholm) or at base of Whitberry Band (Bewcastle). |
| Thickness: |
400 - 550 m. |
| Geographical Limits: |
Langholm and Bewcastle areas of Northumberland Trough. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
Cementstone Group [Obsolete: use INV, BGN, CMNT]
|
| Stratotypes: |
| Type Area |
Langholm area (Lumsden and others, 1967). |
| 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). |
| George, T N, Johnson, G A L, Mitchell, M, Prentice, J E, Ramsbottam, W H C, Sevastopulo, G D, and Wilson, R B. 1976. A correlation of the Dinantian rocks of the British Isles. Special Report of the Geological Society of London, No. 7. |
| 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 |
