I 62 ALASKA GEOLOGY 



abundant in arctic lands. Every collection from Alaska 

 contains numerous examples of this species. The closely 

 allied T. tinajorum was described originally from Port 

 Graham, Alaska. Juglans acuminata was found by 

 Heer at Port Graham also, though first described from the 

 European Miocene. Corylus macquarrii has quite a 

 wide distribution, but is especially abundant in Alaska. 

 It has also been reported from the Fort Union beds of 

 Montana and British Columbia, and doubtfully from the 

 Laramie. Alnus corylifolia has been reported from 

 Cook Inlet. Ulmus braunii, described from the Swiss 

 Miocene originally, has been reported from Kamloops, 

 British Columbia, in strata of probable Eocene age, and 

 from the Green Riverbeds at Florissant, Colorado. Acer 

 trilobatum, as already pointed out, is too poorly preserved 

 to admit of full identification. A form of this species has 

 been found at Herendeen Bay, but it is not possible to say 

 that they are identical. Andromeda gray ana was origi- 

 nally made known from Port Graham, Alaska, but has 

 since been rather doubtfully identified from one or two 

 other localities. 



From this hasty review it appears that four of the ten 

 species have never been found outside of Alaska, while 

 the remainder are abundantly characteristic of the same 

 region. 



It is hardly necessary at this time to go into a history 

 of the plant-bearing horizons of Alaska, as this has been 

 fully done in my Review of the Fossil Flora of Alaska. 1 

 It is sufficient to state that the named species above 

 enumerated are typical of the so-called ( Arctic Miocene,' 

 which is now regarded as of the age of the Upper Eocene. 

 The species described in this paper as new are in various 

 ways allied to forms characterizing this horizon, and I do 

 not hesitate to refer this collection to the Upper Eocene. 



J Proc. U. S. Nat. Mus., vol. xvn, pp. 207-240, pi. ix, 1894. 



