Marbles and calcsilicate rocks rich in scapolite and pyroxene occur near the base of a series of graywackes and siltstones of Precambrian or lower Paleozoic age on the eastern side of the Mount Lofty ranges. Chemical and mineralogic work leads to the conclusion that they resulted from regional metamorphism of impure limestones and calcareous shales under amphibolite facies conditions. The occurrence of actinolite, epidote, and garnet resulted from later metasomatism and reaction, with introduction of additional amounts of material.

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