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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    magnificent form, with leaflets from 8 to 23 cm. in length. It finds its greatest affinity with H. cintiquora of the lower Tertiary of the United States. The Ulmaceae are represented by several leaves that are referred to Ulmus braunii of Heer, though not with- out some hesitation. That the family Aceraceae was present is shown by a number of more or less broken leaves that have been re- ferred to Acer trilobaturn var. They are too fragmentary to venture a positive identification. GEOLOGICAL ASPECT Of the twenty-six forms represented in the collection nine are described as new to science, seven are not named specifically, being branchlets, seeds, scales, broken cones, etc., thus leaving ten species previously known. These are as follows: Equisetum globulosum Lesq. Sequoia heerii Lesq. Taxodiu?n distichum miocenum Heer. Taxodiutn tinajorum Heer. Juglans acumi?iata Al. Br. Corylus macquarrii (Forbes) Heer. Alnus corylifolia Lesq. Uhnus braunii Heer. Acer trilobatum var. Andromeda grayana Heer. Equisetum globulosum was described originally from Cook Inlet, Alaska, and was also detected by Lesquereux in Fort Union beds near the mouth of the Yellowstone River. Sequoia heerii was first found at Sage Creek (?), Montana, in beds of doubtful Green River age. It has since been found in the Upper Clarno formation (Upper Eocene) at Bridge Creek, Oregon, and is now for the first time reported from Alaska. Taxodium distichum mioce- num enjoys a very wide distribution, but is especially