192 



FORMATIONS RECOGNIZED IN THE QUEEN CHARLOTTE ISLANDS. 



POST PLIOCENE. 

 Unconformity, with evidence of some flexure and disturbance of Tertiary beds. 



TERTIARY, probably MIOCENE. 



Complete unconformity, with evidence of great disturbance. Chief period of 

 mountain making. 



f A. Upper Shales and Sandstones 1,500 feet. 



I B. Coarse Conglomerates 2,000 " 



CRETACEOUS, -j C. Lower Shales and Sandstones, with coal 5,000 " 



D. Agglomerates 3,500 " 



E. Lower Sandstones 1,000 (?) " 



Total 13,000 feet. 



Unconformity, but without evidence of great disturbance. 



TRIASSIC, with probably also some CARBONIFEROUS rocks. 



Preliminary lists of the Post Pliocene, Tertiary, Triassic and Palaeo- 

 zoic fossils, prepared by the writer, are given in Dr. Dawson's report. 

 By far the largest number of fossils collected by Dr. Dawson, however, 

 consisting of upwards of one thousand specimens, are from the Newer 

 Mesozoic strata of Skidegate and Cumshewa Inlets, which can now be 

 shown to be of Cretaceous rather than of Jurassic age. An illustrated 

 description of the various species obtained from these Cretaceous rocks 

 will form the subject of the present memoir. As shewn on the geolo- 

 gically coloured map of the islands which accompanies Dr. Dawson's 

 report, the Cretaceous rocks from which the fossils now to be 

 described were obtained occur in the form of a belt averaging nearly 

 fifteen miles in breadth, which crosses the centre of the group some- 

 what obliquely and which extends from Cumshewa and Skidegate 

 Inlets, on the east side, to the west coast. 



The fossils from the purely local divisions A to E, inclusive, of the 

 Cretaceous rocks as given in the preceding tabular view of forma- 

 tions and in Dr. Dawson's report will be described separately in the 

 following pages, in descending order, the localities for each species 

 and the exact horizons from which they were collected being of course 

 given on the authority of the collector. 



