Abstract
‘Crush breccias’ exposed near the top of the Gramscatho flysch sequence in south Cornwall are reinterpreted as a Givetian sedimentary melange and named the Meneage Formation. The melange is in excess of 1 km thick and preserves a distinct stratigraphy with a large proportion of slumped greywacke phacoids and a mudstone matrix throughout. Ordovician quartzite and Devonian limestone phacoids (up to 200 m long) occur in distinct beds. In the centre of the sequence up to 200 m of rudites are interbedded with the melange and towards the top of the formation bimodal volcanics form both interbedded units and large phacoids. The melange probably represents the early stages of deformation of a sedimentary basin generated intracratonically in a strike-slip zone.
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