Components
The complex is made up of an imbricate stack in a sequence that is the same both at Narooma and Murruna Point, Batemans Bay. The top layer consists of turbidite sequence from the Early Ordovician. Below this is a high strain zone full of broken fragments. Special textures from the high strain zone include pressure solution, dilational veins and boudinage. Some of the rock appears as mylonite. Underneath the high strain is chert from the Late Cambrian to Late Ordovician.
The lowest part of the stack is block in mélange. The blocks are mostly turbidite, but also includes chert, and some pillow lava basalt. The blocks are at all different orientations, different sizes all mixed together. The sediments were deformed into these blocks before they turned into stone. Later deformation has developed a cleavage with lenses of chlorite, quartz and white mica. The strike direction of the cleavage is 330°. The interpretation of the mélange is that it is either an olistostrome or an upwelling. The mélange was underplated beneath the chert layer. Pockets of underplated material are expected to form low angle detachments.
The inland zone has a chevron folded structure with reverse faults.
Read more about this topic: Narooma Terrane
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