The boyndie syncline, a D1 structure in the Dalradian of Scotland

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Abstract
The structure of the Dalradian rocks of the Banffshire coast has been re‐examined. It is shown that D1 structures face upwards along the entire section and the major Boyndie Syncline (Sutton and Watson 1956) must also be of D1, age and not D3 as proposed by Johnson (1962). D2 structures are developed in the west, most strongly in the Portsoy Group and Cowhythe Gneiss where they may be related to the Portsoy Thrust (Elles 1931). East of the Cowhythe Gneiss D2 structures are not developed but D3 structures are of local importance. Porphyroblast growth is considered to be post‐D1, pre‐D3 related to the ‘active’ D2 deformation in the west (Barrovian) and to the ‘static’ D2 interval in the east (Buchan). The wider implications of these conclusions for Dalradian structure are briefly considered.

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