I03 



and the roof contact of a granodiorite batholith, at Hedley; 

 Oligocene lake basins at Princeton, and Nicola; the plati- 

 num and diamond bearing peridotite, at Tulameen. 



ANNOTATED GUIDE. 



MIDWAY TO HEDLEY. 



Miles and 

 Kilometres. 



o m. Midway — Alt. 1,908 ft. (581-5 m.). Midway 



o km. is a small town of a few hundred inhabitants, 



situated in the drift-filled valley of Kettle river 



at the mouth of Boundary creek. It lies in an 



area of Oligocene rocks, consisting of somewhat 



disturbed volcanic flows and cuffs, interbedded 



with vSandstones and shales. Associated with 



them are some thin seams amd lenses of lignite. 



For three miles (4-8 m.) beyond Midway the 



Great Northern railway runs westward along the 



valleys of Kettle river and Myers creek through 



an open, wooded, park-like country, and after 



passing through a tunnel enters a narrow gorge, 



cut in massive Oligicene lavas. 



9m. Bergen — Alt. 2,409 ft. (733-2 m.). Beyond 



14-5 km. Bergen the valley broadens into open, grassy 



meadows, partly under cultivation, and in the 



railway cuttings are exposures of Oligocene 



slates and sandstones which dip eastward and 



form the western border of the basin through 



which the railway has run from Midway. 



These rocks resc unconformably on much 



disturbed and compressed Palaeozoic schists, 



which are considered to be of Carboniferous 



age and correlated with the Cache Creek group. 



They extend for two and a half miles along 



the railway, to Mile post 79, where they give 



place to a body of Jurassic granodiorite which 



is intrusive into them. 



14 m. Myncaster — Alt. 2,732 ft. (832 •4m.). Palaeo- 



22-5 km. zoic schists again appear at Myncaster, 



replacing the granodiorite. From this point 



the railway turns abruptl}^ to the north and 



after series of sharp curves crosses from the 



valley of Myers creek to that of Rock creek. 



