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Excerpt from The Journal of Geology, 1922, Vol. 30 Pre-Silurian. - In the more recent accounts of the history of New Zealand it has been customary to consider as of Pre-Cambrian age the complex of gneisses and associated metamorphic rocks in the southwestern extremity, but the evidence for so doing is not yet conclusive, and various authors have referred the plutonic gneisses therein to different periods, extending as late as the Cretaceous. It would appear that the more probable hypotheses could be limited to two. The first definite point lies in the proved existence of Lower Ordovician rocks in the extreme northwest and southwest of the South Island (Fig. I). About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.