The BGS Lexicon of Named Rock Units — Result Details

East Linton Lava Member

Computer Code: ELLA Preferred Map Code: notEntered
Status Code: Full
Age range: Visean Stage (CV) — Visean Stage (CV)
Lithological Description: The East Linton Lava Member consists characteristically of macroporphyritic ankaramites (Craiglockhart type) and basaltic hawaiites (Dunsapie type), both with olivine and clinopyroxene (large augite) phenocrysts and the latter, also plagioclase. Non-porphytic trachybasalts of mugearite type and one of leucite-bearing kulaite are also present. Beds of tuff and lapilli tuff also occur in the succession. Flows are usually 5 to 15m thick, the upper half being slaggy and vesicular.
Definition of Lower Boundary: The base is conformable or locally unconformable on the North Berwick Pyroclastic Member. The change is from basaltic pyroclastic rocks to mafic lava flows.
Definition of Upper Boundary: The Member is overlain by the Hailes Lava Member. The contact is conformable and locally unconformable. The change is from either ankaramite and basaltic hawaiites to olivine-basalt and mugearite.
Thickness: 0 to 90m
Geographical Limits: East Lothian, outcrop of the Garleton Hills Volcanic Formation around North Berwick, East Lothian, Garleton Hills, Stenton and in the subcrop farther west in the BGS Spilmersford Borehole near Pencaitland, but absent adjacent to the Lammermuir Fault.
Parent Unit: Garleton Hills Volcanic Formation (GHV)
Previous Name(s): East Linton Member (-1525)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  East Lothian around 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