Geological investigations of the Lynn Lake basic intrusive body, northern Manitoba

Abstract

...The topography of the map area is typical of most of the Precambrian terrain of the region. Relief is low, but alternating ridges and low ground give the country a rugged appearance. Outcrops are few and the ridges are mainly of glacial drift, sand, and boulders. Few of the ridges rise more than 50 feet above the surrounding muskeg except several high ridges of sedimentary rocks in the eastern part. Within the area covered by the intrusive body, the ridges are more or less parallel, and trend generally from north 10 degrees east to north 30 degrees east. Areas of low ground, swamp, and muskeg lie between the ridges and cover extensive parts of the east and south of the map area. The western part of the intrusive body is marked by low ground, and Lynn Lake lies in the southwest corner of this part. Within the area of the instrusive body, outcrops are rare and are confined mainly to several large ridges. A few scattered outcrops occur on the smaller ridges and within the muskeg. Outcrops are more plentiful near the north contact, and the area of the bordering volcanic and sedimentary rocks.