Minerals found in rock exposed due to road widening, most recently in 1989-90 when a second carriageway was constructed. Embankment formed at the time now grassed over.
Ref: Alabaster, C., 1990. Alstonite and barytocalcite from Llantrisant, South Wales and barytocalcite from Holwell, Mendip Hills, England. Journal of the Russell Society, 3, 1-6.
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UK OS Grid Reference: ST051820
Map Reference: 51°31'42"N , 3°22'5"W
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