 Mount Logan rises to an elevation of immediately to the east, and south of Logan Canyon.The eastern portions of the city are constructed on top of shelf-like "benches", late Pleistocene sedimentary deposits created by the glacially fed Logan River feeding into the northern stretches of Lake Bonneville, building a "Gilbert-type" river delta over several thousand years.The Logan River later cut down through these sedimentary deposits following the draining of Lake Bonneville approximately 14,500 years ago.