Geology and paleontology / by B.K. Emerson [and others].

Date:
[1910]
Catalogue details

Licence: In copyright

Credit: Geology and paleontology / by B.K. Emerson [and others]. Source: Wellcome Collection.

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    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 ?nacquarrii 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. 1 Proc. U. S. Nat. Mus., vol. xvn, pp. 207-240, pi. ix, 1894.