The Archaean is a complex of sedimentaries and eruptives much folded and sheared, the combined result being a gen- eral N.E. strike and S.E. dip of the shearing planes, often mistaken for stratification. This complex contains a considerable limestone, whether at one or more levels is un- clear. This limestone is commonly also a hornblen- drite, more or less pyroxenitic, garnetiferous, magnetic, &c., as the result of paramorphism. The limestone is probably not at the top of the Archaean series, but forms a large bed in the same, and has enf- folded all the foldings of the other Archaean strata.