The BGS Lexicon of Named Rock Units — Result Details

North Berwick Pyroclastic Member

Computer Code: NBPY Preferred Map Code: notEntered
Status Code: Full
Age range: Visean Stage (CV) — Visean Stage (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 (-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). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S033 S033