This work investigates the geological formations and structures of the Victoria and Saanich map-areas on Vancouver Island, British Columbia. Charles Horace Clapp, a geologist with extensive experience in the region, presents a detailed analysis based on field surveys and existing geological data. The book aims to provide a comprehensive understanding of the area's bedrock geology, stratigraphy, and structural features, contributing to the broader knowledge of Pacific Northwest geology.

This publication is a foundational geological survey of a specific region in British Columbia. Its detailed mapping and stratigraphic analysis are characteristic of classic regional geological reports, intended for specialists and researchers in earth sciences. The work's value lies in its systematic documentation of geological features, providing essential data for further scientific inquiry and resource exploration in the area.