Nature of late-Early to Middle Devonian tectonism in the Buckambool area, Cobar, New South Wales

In the Buckambool area, Cobar, New South Wales, the boundary between dominantly shallow-water, shelf sediments of the Winduck Group and fluviatile sediments of the Mulga Downs Group has been established as a small hiatus not resolvable by available fossil age data. Although dips are parallel over much of the area, disconformable and locally angular unconformable relations are present. This hiatus, late-Early to Middle Devonian in age, marks a period of uplift, localised folding and erosion. These reflect movement of basement blocks along major fractures that are now revealed as lineaments.