Sugarloaf Rock Coastal Exposure

Description

Coastal outcrop exposed directly south of Sugarloaf Rock, Leeuwin Inlier, Western Australia. Large-scale, west-verging, moderately northeast-plunging asymmetric antiform/synform pair. A migmatitic, grey, granodioritic gneiss containing abundant folded boudin trains of amphibolite is exposed in the core of the antiform. One generation of leucosomes crosscut the amphiblote layers and are in the axial plane of the folds. The outer part of the folds is dominated by migmatitic, pink monzogranitic gneiss, that was intruded by mafic dykes prior to folding (see western side of exposure). Six builder squares 60 x 40 cm were placed accross the model, the red ends indicate North.