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Bronsil Shale

Ordovician (Tremadoc)

PERIOD	GROUP	FORMATION
Ordovician	-	Bronsil Shale

Lithology
Fissile silver-grey mudstone.

Upper Boundary
Faulted or unconformity.

Lower Boundary
Probably conformable with White-leaved Oak Shale.

Representative Sites
Colehill Cottage Cutting

Information on lithology and boundaries taken from the British Geological Survey Lexicon of Named Rock Units
and BGS Memoirs.