162 Pt'of. J. D. Dana — Metamorphism of 



I have even heard a tradition of the Indians of the Easse River 

 which relates that, at some time very remote in their history, an 

 eruption covering a wide tract of country with lava was witnessed. 



The organic remains so far obtained from these Tertiary rocks of 

 the interior consist of plants, insects, and a few freshwater molluscs 

 and fish scales, the last being the only indication of the vertebrate 

 fauna of the period. The plants have been collected at a number 

 of localities. They have been subjected to a preliminary examina- 

 tion by Principal Dawson, and several lists of species published. 

 While they are certainly Tertiary, and represent a temperate flora 

 like that elsewhere attributed to the Miocene, they do not afford 

 a very definite criterion of age, being derived from places which 

 must have differed much in their physical surroundings at the time 

 of the deposition of the beds. Insect remains have been obtained 

 in four localities. They have been examined by Mr. S. H. Scudder, 

 who has contributed three papers on them to the Geological 

 Eeports,' in which he describes forty species, all of which are 

 considered new. None of the insects have been found to occur in 

 more than a single locality, which causes Mr. Scudder to observe 

 that the deposits from which they came may either differ consider- 

 ably in age, or, with the fact that duplicates have seldom been found 

 even in the same locality, evidence the existence of different sur- 

 roundings, and an exceedingly rich insect fauna. 



Though the interior plateau may at one time have been pretty 

 uniformly covered with Tertiary rocks, it is evident that some 

 regions have never been overspread by them, Avhile, owing to 

 denudation, they have since been almost altogether removed from 

 other districts, and the modern river valleys often cut completely 

 through them to the older rocks. The outlines of the Tertiary areas 

 are therefore now irregular and complicated.^ 



( To be continued in our next Number.) 



III. — On a Case in which various massive Crystalline Rocks 

 INCLUDING Soda-Granite, Quartz-Diorite, Nokite, Horn- 



BLENDITE, PyROXKNITE, AND DIFFERENT ChRYSOLITIO RoCKS, 

 WERE MADE THROUGH MetAMORPHIC AgENCIES IN ONE MeTA- 



MORPHic Process. 

 By Prof. James D. Dana, LL.D., A.M., For. Memb. Geol. Soc. Lend., 

 of Yale College, New Haven, Ct., U.S.A. 

 Part III. 

 (Concluded from page 119.) 

 ri'^HE extent of these bands, their number, uniformity of direction 

 J and apparently of dip, and the identity of the material con- 

 stituting them with beds of the schist, especially the more northern, 

 are such as to warrant the following section (Fig. 15). 



1 Eeports of Progress, Geol. Survey of Canada, 1875-6, p. 266; 1876-7, p. 457; 

 1877^8, p. 175, B. 



■^ For additional information on the Tertiary rocks of the interior, see the following 

 Eeports of Progress, 1871-2, p. 56 ; 1875-6, pp. 70 and 225 ; 1876-7, pp. 76 and 

 112, B. 



