A Reconnaissance Across the Mackenzie Mountains on the Pelly, Ross, and Gravel Rivers, Yukon, and North West Territories, Issue 1097Results of field work of 1907-08. |
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A. P. Low Alberta argillites banks bed-rock beds boulder clay British Columbia Campbell creek Canada chert Christie pass colour crystalline schists D. B. Dowling deposits diabase distance divide dolomite drainage drift Eastern Townships erosion feet flows Frances river G. M. Dawson Geological sheet glacial Gravel river grey headwaters Hoole river Hudson bay Indians intrusions J. B. Tyrrell Klondike L. W. Bailey Lewes lake Liard limestone lower lynx Mackenzie mountains Mackenzie river Macmillan river miles Mineral Mining district mountain groups mouth of Twitya Natla Pelly river portion prospectors quartz quartzite R. G. McConnell R. W. Ells region Report River sheet Ross river sandstone Saskatchewan scale 25 scale 40 scale 400 ft scale 8 m.1 schists sedimentary rocks Sekwi Sheldon lake side Slate rapid spruce Stewart river strata streams Sudbury Sudbury district thickness timber topographic tributaries Twitya river upper upper Liard valley vicinity western slopes Yukon plateau
Popular passages
Page 36 - Cascade formation the red shales contain bowlders and lenses of limestone varying from a few inches to a foot or more in thickness. The rock is dense, blue gray in color, weathering light buff, and contains numerous fresh-water fossils.
Page 14 - the structure is characterized by folding, generally on a broad scale, which has thrown the strata into a series of anticlines and synclines; but the folding is sometimes close, and in certain cases the folds appear to be overturned and overthrust."2 The general strike of the beds in these mountains as far north as latitude 65 degrees north is slightly west of north, but at that latitude the trend of the ranges changes and they swing in a wide circle to the westward round the upper branches of Peel...
Page 16 - ... this mountain system, are en Echelon, in character, the different ranges not persisting any great distance, but instead giving place in either direction to other parallel ranges. The Mackenzie mountains, which include the greater part of the Rocky Mountain system in Yukon, are described by Keele1 as a complex of irregular mountain masses which are the result of deformation and uplift, include summits rising to heights of 7,000 to 8,000 feet above sea-level, and have a maximum width of about 300...
Page 16 - ... in a very contracted bed, which at rare intervals opens out into a narrow alluvial flat. The structure of these mountains differs from that of the ranges to the west, being apparently due to fracturing, buckling and faulting of the strata, and the residual masses present the appearance of a series of faulted and tilted blocks. The principal lines of fracture are in a northwest-southeast direction, and the beds have a prevailing southwesterly dip. Escarpments produced by tilted strata, overlooking...
Page 19 - ... carried by the stream exceeding the amount of coarse material deposited. There is very little decrease in velocity as the Mackenzie river is approached, and the Gravel river finally rushes into the greater river, with an impact that carries its water and sediment several hundred feet into the latter before it is brushed aside by the flood of the great river. The Gravel river has built up an alluvial flat at its mouth, and...
Page 44 - All these materials are of a dark-grey muddy colour, and have a total thickness of about 500 feet. The broken plain bordering the Mackenzie is underlain by blue clay with a more or less gravelly admixture, on top of which is yellowish sand or sandy gravel. The gravels contain a large proportion of black chert or slate pebbles derived from the underlying Cretaceous conglomerate. About four miles from the Mackenzie the Grav«l river swings against a clay bank about 200 feet in height, and of a dark-grey...
Page 16 - Mackenzie waters, which are said to traverse valleys lying well below timber line, containing small lakes and an ill-defined water parting at the divide. The mountains in the vicinity of the watershed are not higher than many of the groups situated at considerable distances from it, so that the divide is not the most important element in the relief of the region, and does not form a natural division line separating the eastern and western slopes as distinct topographic provinces. The development...
Page 8 - Pike2 crossed from the Liard river to the Pelly lakes, by way of the west arm of Frances lake and Ptarmigan creek. When the spring opened he descended the Pelly and Yukon rivers to Bering sea. The published account of his journey contains a map of the Pelly lakes and vicinity, and a short account of the geology by Dr. Dawson, based on rock specimens brought out by Mr. Pike. The years 1897-8 saw great numbers of people — attracted by the newly discovered rich gold-field of the Klondike — travelling...
Page 8 - ... was a party which started from Fort Norman on the Mackenzie river in the 'month of November, 1897, hauling their outfits on sleds, under the guidance of an Indian. They followed the Indian trail to the Gravel river, and went up the Twitya river to the divide. After crossing the divide they followed one of the branches of the Hess river, reaching boating water on this stream in April, 1898, and descended the Hess and Stewart rivers to the Yukon. Little was learned from their experience besides...
Page 12 - The names Selwyn range and Ogilvie range have been applied in former reports and on previous maps, to cover a considerable portion of these mountains. It has been found impossible to define the limits of these subdivisions, on topographic grounds, hence the name Mackenzie mountains has been given to the highlands as a whole.