| Computer Code: |
NBPY |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Visean Age (CV)
— Visean Age (CV) |
| Lithological Description: |
The North Berwick Pyroclastic Member consists of green (lower part in the north) and red coloured (all in the south) tuffs and lapilli-tuffs and agglomerate locally with sedimentary intercalations of a lacustrine limestone, the Sunnyside Limestone, up to 2.9m thick. These are commonly well bedded and waterlain and interbedded with volcaniclastic sedimentary rocks including thin dolostones and siliciclastic mudstones with sandstones showing ripplemarks. |
| Definition of Lower Boundary: |
The base is conformable on the underlying Ballagan Formation (Strathclyde Group). The change is transitional by interbedding of tuff and lapilli tuff into the underlying siliciclastic and carbonate rocks. |
| Definition of Upper Boundary: |
The Member is overlain by the basaltic flows of the East Linton Lava Member to south of the Dunbar-Gifford Fault where the somewhat younger siliciclastic Gullane Formation rests directly on it. The contact is conformable and locally unconformable. |
| Thickness: |
0 to 220m |
| Geographical Limits: |
East Lothian outcrop of the Garleton Hills Volcanic Formation around North Berwick, East Linton, Garleton Hills, Stenton and in the subcrop farther west in the BGS Spilmersford Borehole near Pencaitland, and south to the Lammemuir Fault. |
| Parent Unit: |
Garleton Hills Volcanic Formation (GHV)
|
| Previous Name(s): |
North Berwick Member [Obsolete Name and Code: Use NBPY]
(-413)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
East Lothian around North Berwick, East Linton, Garleton Hills, Stenton and in the BGS East Linton and Spilmersford Boreholes. (Davies et al., 1986, Figure 10, McAdam and Tulloch, 1985, Figure 17). McAdam and Tulloch. 1985. |
| Reference(s): |
| McAdam, A D and Tulloch, W, 1985. Geology of the Haddington district. Memoir of the Geological Survey, sheet 33W (Scotland). |
| Davies, A, McAdam, A D and Cameron, I B. 1986. Geology of the Dunbar district. Memoir of the British Geological Survey, Sheet 33E and part of Sheet 41 (Scotland). |
| Dean, M T, Browne, M A E, Waters, C N and Powell, J H. 2011. A lithostratigraphical framework for the Carboniferous successions of northern Great Britain (onshore). British Geological Survey Research Report, RR/10/007. 165pp. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S033
S033
|
