Abstract
Fold-cleavage relationships are described in the Cadair Idris area of the Lower Palaeozoic Welsh Basin, which includes the western part of the Bala Lineament. Many fold hinges are transected by the broadly contemporaneous Caledonian (Lower Devonian) cleavage. Transection angles are amongst the highest yet described from the Welsh Basin. There is a close relationship between fold strike and sense and amount of transection; N-S folds are clockwise transected, NE folds have an axial planar cleavage whilst ENE folds are anticlockwise transected. Similar relationships occur throughout the central Welsh Basin. A model of progressive deformation is described whereby weak regional transpression is modified by local factors. Viscosity contrasts are recognized as one of the most important controls on the timing of fold development and the amount of transection.
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