The wilderness is on the northwest side of Brush Mountain, a 2900 foot high ridge with many hollows stretching down from the ridge to Craig Creek. Hollows with names such as Hazelnut Hollow, Sugar Bottom Hollow and Sugar House Hollow probably refer to the natural resources that were gathered in the area. Others such as Betsy Boating Hollow, Jones Hollow, and Leyman Hollow may represent names of families that lived in the area at the end of the nineteenth century. The wilderness is located a few miles north of the continental divide. The rock strata forming the wilderness are tilted upward to the north. To the south are
Mississippian layers, formed between 320 and 360 million years ago. On the upper reaches of the mountain is tough
Devonian sandstone, formed between 360 and 408 million years ago. It caps Brush Mountain and juts out to the north at the top of the wilderness slope. Below it lies brittle layers of older and more loose Devonian shale which is subject to erosion. The lower reaches along Craig Creek valley contain
Silurian sandstone, formed between 408 and 438 million years ago and extending northwest to form Sinking Creek Mountain. ==Management==