Reviews — Geological Survey of Canada. 83 



move than once carried away by denudation, until at the present day 

 we find the existing mountains low in comparison with some of 

 those of the further interior, but consisting for the most part of 

 granitic rocks of deep-seated origin, with but scanty remnants 

 of the older members of the Palaeozoic series resting upon their 

 flanks or remaining as infolds in their mass. Very often, and over 

 large areas along the littoral of these ranges, the beds which rest 

 directly upon the granites are of Triassic age ; but from this it is 

 not to be argued that the older formations have never existed there, 

 for these may only have passed beyond recognition by entering as 

 component parts into the subjacent granitic magma. 



Under " Descriptive Geology " (pp. 79 b to 308 b) local details 

 are entered into, and the data relied upon in laying down the 

 geological lines discussed ; these supplement the broad indications 

 afforded by the map. Appendices follow : (1) upon the petro- 

 graphical characters of some rocks from the area of the Karaloops 

 map-sheet, by W. F. Terrier; (2) Shuswap names of places, by 

 Dr. Gr. M. Dawson; (3) upper and lower limits of growth of some 

 troes and other plants as climatic indices ; (4) comparative observa- 

 tions of temperature at different altitudes in or near the region 

 embraced by the Kamloops sheet, southern interior of British 

 Cdlumbia, during parts of the years 1888, 1889, and 1890. 



Mr. E. G. McConnell (Report, pp. 1 c to 40 c) was engaged 

 during the earlier months of the j'ear in working up the results of 

 his exploration of the previous summer in the Finlay Eiver and 

 Omenica country, of northern British Columbia. The oldest rocks 

 in the district are of Archfean age, and belong to the Shuswap series 

 of Dr. Dawson. They consist of a series of well-foliated mica- 

 gneisses, probably derived to a large extent from sheared eruptives, 

 lustrous mica-schists, hornblende- and actinolite-schists, quartzose- 

 sohists, and crystalline limestones, filled with mica, hornblende, and 

 other secondary minerals. The rocks of this series are usually 

 evenly bedded, and are conformable with the overlying formations. 

 Rocks consisting of slates, quartzites, and conglomerates, probably 

 referable to the Lower and Middle Cambrian, are the next in 

 succession. They have a thickness on the Omenica of about 4,000 

 feet. Grayish bedded limestones, holding corals, brachiopods, and 

 other fossils characteristic of the Banff or Devono-Carbonifevous 

 division of the Bow River section, occur in the eastern ranges of the 

 Rocky Mountains ; while near the centre of the range, lower beds, 

 probably Silurian in age, holding Hahjsites catenulatiis were found 

 in one place. Volcanic foliated schists and associated rocks, 

 probably of Upper Paleeozoic age, were found exposed along the 

 Omenica. Triassic beds with Monotis subcircularis occur in the 

 second range of the Rocky Mountains. Tertiary (Upper Laramie) 

 beds, consisting of conglomerates interbedded with shales and sand- 

 stones, occupy the bottom of the valley of the Finlay. Some leaves 

 and other plant-remains were yielded by the shales, and were 

 determined by Sir J. William Dawson. The genera represented 

 were Ariindo, Sequoia, I'ojjulus, Flatanus, Quercus, Grewia or 



