101 “Other flat-topped hills to the north and northeast appear to be capped by the same conglomerate. The complete thickness of the formation is not represented at any locality visited, and must have been considerably more than 600 feet.” Liard River Valley The Fort Nelson formation outcrops in two parts of the Nelson Forks map-area (Kindle, 1944). A long band lies east of Toad River, continues along the east side of Toad and Liard River Valleys, and extends beyond Beaver River. A section was measured by Kindle on the east side of Liard River, opposite the mouth of Scatter River. ‘The bottom of the section is 1,660 feet above the river, where the Fort Nelson formation conformably overlies the Lower Cretaceous shales of the Lépine formation.” This section is as follows: : Thickness Top of Section Feet Conglomerate; clean, well-washed beds.............020--.000 325 Sandstone, clean, coarse, yellow...............seeessccceeees 15 Shale dark: Gehrke pe sre te eee ee teenie ee ose) Oe Cee 20 Sandstone and shale, interbedded..................00eeeeeees 40 Wonglomeratetymassive trite tee fone ieaha ee vice Mersiaeeoelniod 30 Sandstone, coarse, yellow, crossbedded.............0222200005 15 Sandstone and shale, interbedded...............200eeeeeeeees 25 Conglomerate, massive, mostly grit size............--+---20e 20 Sandstonescoarsessyellowmerceriien icicle to iete cemiieisicieieiee 40 Totalithickness yer. sveyspeie- ciel i282 csceyelatajsievsis isis sis) 530 A second area of outcrop is that along the valley of Fort Nelson River from Patry Lake nearly to Nelson Forks. Kindle notes that the “first out- crops to be seen from Fort Nelson River below Fort Nelson are flat-topped bluffs of conglomerate, grit, and sandstone. They rise to 1,000 feet above the river at distances of 2 or 3 miles north and south of the stream and, roughly, 35 miles southeast of Nelson Forks. A few miles farther down- stream the bluffs are close to the river, and they form its east bank for 12 miles. They decrease gradually in height toward the northwest and dis- appear beneath the drift 10 miles south of Nelson Forks. The conglomerate beds strike northeast and dip from 2 to 3 degrees northwest, thus accounting for the gradual topographic slope to the northwest. The lower slopes below the nearly vertical cliffs of conglomerate that face the river are littered by a talus of huge conglomerate blocks that conceal the underlying shale formation. The bluffs were climbed in two places, 3 miles apart, and at each place were found to comprise about 400 feet of conglomerate with minor beds of sandstone. The conglomerate forms both thin and thick massive beds, and in places shows well-defined crossbedding. Much of the conglomerate is of grit size, with a scattering of larger pebbles; in other beds the pebbles are close packed and range from 1 to 3 inches in diameter. The pebbles are of quartz, chert, slate, argillite, quartzite, chalcedony, jasper, and minor calcite or limestone’. Petitot River An outcrop of the Fort Nelson formation is mapped by Hage (1945) on the lower part of Petitot River and crossing the Liard above Fort Liard, and is estimated to have a thickness of 500 to 800 feet. It is described by Hage as follows: