ABSTRACT
Geomorphology of the region is mainly a product of geological events that occurred in the Tertiary and Quaternary Periods. This physiographic evolution initiated with uplift of the Coast Mountains followed by dissection of the uplifted surface. Recurrent glacial erosion and deposition during the Pleistocene Epoch, further modified the major valleys, creating classic Ushaped forms, particularly along the main Phillips River valley which drains southwest into the major trough of Phillips Arm. Topography is largely bedrock controlled and surficial materials are usually thin on the middle to upper valley walls. Deposition of surficial deposits is most extensive along valley floors and lower slopes, often resulting in thick accumulations of pre-glacial, glacial, and/or post-glacial sediments. Glacial erosion increased local relief and ruggedness. Upper elevations are characterized by large areas of bare bedrock, glacial ice and thin surficial materials, with landscapes ranging from smooth rounded glacial surfaces to extremely rugged cliffs and ridges sculpted by valley and alpine glaciers.
