Southern British Columbia can be subdivided into five belts running roughly parallel with the north-westerly grain of the Cordillera. These five belts, from west to east, today are called the Insular, Coast, Intermontane, Omineca and Foreland belts. They reflect the geological processes which, from Precambrian time (>700 million years ago) to the present, interacted to make the mountains, but are dominated by features formed during mountain building between Early Jurassic and Early Tertiary time, that is, between 185 and 50 millions years ago.