The southeastern Lachlan Fold Belt at Batemans Bay on the New South Wales south coast is an accretionary complex with a prolonged deformation history. Early features include synsedimentary folds, mélange, disaggregated bedding and faults. Fabrics within the clast-in-matrix mélange and mudstone match those found in cores from the lower slopes of modern accretionary prisms. At the toe of the accretionary prism, the contact between the craton-derived Adaminaby Group and ocean floor deposits of the Wagonga Group is conformable. As subduction continued, the early structures were overprinted by (D₁) deformation that produced meridional north - south-trending, tight to isoclinal folds (F₁) and associated axial-plane cleavage (S₁). This west-dipping subduction occurred in the Late Ordovician/Early Silurian but probably began much earlier. A younger regional deformation (D₂) resulted in north - south-trending, open to tight folds (F₂), slightly oblique to F1, and an axial-surface cleavage (S₂).
Australian Journal of Earth Sciences Vol. 54, Issue 4, p. 481-501