THE LATE PALEOZOIC IN BRITISH COLUMBIA 177 



In the Lillooet map area 1 and in the area between Lillooet and Chilkas 

 Lakes practically the same series occurs, according to Bateman. 



If any part of this section is Carboniferous it is the White Cap series, 

 which has been very seriously affected by the great bathylithic intrusions 

 to the west. 



The Highland Valley Copper Camp, Ashcroft Mining Division, near 

 Kamloops Lake, shows, according to Drysdale, 2 the Cache Creek series, 

 including cherty quartzite, argillite, greenstone, and limestone (Marble 

 Canyon limestone). This is lithologically near to the Bridge River series 

 and possibly represents the lower part only, being Devonian in age.* 



Drysdale, in the last-cited paper, after giving the section on the Thompson 

 River near Kamloops Lake quoted above, makes some remarks, page 132, upon 

 the 



" Conditions of deposition. The rocks belonging to the Cache Creek formation 

 were probably laid down in a Carboniferous sea ('Vancouver Continental Sea'), 

 slowly transgressing from the northwest upon a low-lying area ('Cascadia' 

 positive element) which probably supported abundant vegetation. In this con- 

 tinental sea, argillaceous, arenaceous, and calcareous sediments were deposited. 

 The limestones represent the off-shore deposits, whereas the carbonaceous argil- 

 lites and sandstones represent the inshore phases. 



"Marine sedimentation was interrupted at intervals by volcanic activity, 

 which resulted in the accumulation of much volcanic dust and the outpouring 

 of lavas." 



He also remarks upon the "age and correlation," from which the follow- 

 ing is summarized. Fossils have been found in the Cache Creek series 

 near Thompson River (on the Caribou Wagon Road, 2.5 miles above the 

 89-mile stable) which belong between the base of the Devonian and the 

 top of the Permian. Beyond this region to the north Fusulina has been 

 found at Stewart Lake, latitude 54 30', Dease River, 59 15', Frances 

 River, 60 30', and Tagish Lake, 60. 



The Cache Creek series may be correlated with the Attwood series of 

 Daly (Memoir 38, Canadian Geological Survey), and the upper part of the 

 Brooklyn limestone of Phoanix 4 and the Gloucester limestone of Franklin. 6 

 With the existence of an angular unconformity above this series and below 



1 Bateman, A. M., The Lillooet Map-area, British Columbia, Summary Report Canadian 



Geological Survey for 1912, p. 188. 



Exploration between Lillooet and Chilkas Lake, British Columbia, idem, p. 177. 

 1 Drysdale, C. \V., Highland Valley Copper Camp, Ashcraft Division, British Columbia, 



Summary Report Canadian Geological Survey for 1915, p. 89, 1916. 

 1 For further description of this region see: 



Dawson, G. M., Annual Report Canadian Geological Survey, vol. 7, p. 1-4278, 1896. 

 Drysdale, C. \V., Geology of the Thompson River Valley below Kamloops Lake, British 

 Columbia, Summary Report Canadian Geological Survey for 1912, p. 115, 1913. 



4 LeRoy, O. E., The Geology and Ore Deposits of Phoenix, Boundary District, British 



Columbia, Memoir 21, Canadian Geological Survey, 1912. 



5 Drysdale, C. \V., Geology of Franklin Mining Camp, British Columbia, Memoir 56, 



Canadian Geological Survey, pp. 14, 144, 1915. 

 13 



