Abstract

Introduction

The importance of rock weathering is equally great, whether viewed from the purely scientific or from the economic standpoint.

As the initial step in the processes of subaerial denudation and subsequent deposition and in other relations, weathering demands the most serious consideration of geologists ; while for a rational study of soils and of building stones, as well as for a thorough understanding of the conditions presented in the superficial portions of ore deposits, a knowledge of the principles of weathering is indispensable.

This is exemplified by, to cite only a few instances, such papers as those of Pumpelly,* Reade, Chamberlin and Salisbury, and Russell.§ on the one hand, and of Shaler,* Hilgard, and Penrose, on the other.

A decided impetus has recently been given to the study of weathering in general, both as to the processes involved and the results attained, by Dr G. P. Merrill’s admirable series . . .

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