South of Coquihalla, rock tends to be more sedimentary in character. Tulameen Mountain exhibits strong bedding planes dipping to the NE, which have named the range as a whole. Fossils can be found here.
Along the south edge of the Coquihalla River valley, there are a number of spectacular landslide scarps in the unconsolidated volcanic material (near Hidden Creek, for instance). The valley was overdeepened by glaciation, and when the ice melted, the now-unstable valley walls collapsed. Something similar occurs today in the Meager Volcanic complex. History: Native peoples traversed through this area when passing from Tulameen country to Hope area, as did early European explorers and fur traders. After construction of the Kettle Valley railway the area became a bit of a backwater. Today, mountaineering use of the area is heavily outweighed by snowmobilers (in winter/spring) and industrial users such as loggers (summer/fall). There are some nice scrambling peaks in the area which makes it a good place to visit if you want guaranteed solitude.