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The prominent basement rocks of the Brumado area are Precambrian in age and consist dominantly of gneisses, schists, and amphibolite .
It contains a variety of lithologies including augen gneiss, quartzite, amphibolite , calc-silicate, pelite and marble.
It grades into a manganese-rich ilmenite that ultimately replaces the spinel phase near the transition to the garnet amphibolite .
A uniform, regionally concordant layer of amphibolite with occasional ultramafic pods, termed the Sta Amphibolite, overlies the Sta Series.
Field observations show that the gabbroperidotite section had already cooled to amphibolite - to greenschist-facies conditions when the dykes intruded.
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