MESOZOIC TIME — CKETACEOUS. 



839 



A report by J. S. Newberry, on the plants of the Tf aritan group of the Atlantic border, 

 nearly ready for publication at the time of his death m 1»92, has not yet appeared (1894). 

 A few Long Island species have been described and figured by A. HoUick (1892-93). 

 They were from the clays on the north side of the island between Eaton's Neck and Glen 

 Cove. 



An account of the plants of the Dakota group is contained in Lesquereux's quarto 

 reports — one volume published in connection with the reports of the Hayden Expedition, 

 and another posthumous volume, edited by F. H. Knowlton, published as vol. xvii. of 

 the Memoirs of the U. S. Geological Survey (1893). The flora, so far as now known, in- 

 cludes 429 Angiosperms, 8 Endogens, 15 Conifers, 12 Cycads, and 6 Ferns ; in all 470 

 species. As Knowlton states, the proportion of Cycads is nearly the same as in the Atane 

 group of Greenland described by Heer, while the Angiosperms make 91 per cent of the 

 whole and in the Atane group 72 per cent ; and a fourteenth of the whole are identical 

 with Greenland species. The spirally marked fruit of a Char a, G. Stantoni, has been 

 found by Knowlton in the Bear River beds. 



The Laramie plants also were described by Lesquereux in one of the quarto volumes 

 of the Hayden Expedition reports. But it is found that there is some uncertainty with 

 regard to localities, and the subject is undergoing revision. They include no Cycads. 



The following lists of characteristic species of the Laramie and Denver gi-oups are from 

 F. H. Knowlton : — 



Fossil plants characteristic of the Lower Laramie : 3Iusoplnjllum complicatum, Flabel- 

 laria eocenica, Ficus lanceolata, Ficus latifolia, Quercus angustiloba, Sterculia modesta, 

 Anona robusta, Dombeyopsis squarrosa, Nelumbium tenuifolmm, Bhamnus salicifolius, 

 Cornus suborbifera. ' 



Fossil plants characteristic of the Denver group : Osmunda affinis, Asplenium erosum 

 (Fteris erosa Lx.), Aspidium Lakesii, Woodioardia latiloba, OreodoxUes p)licatus, Ficus 

 occidentalis, F. spectabilis, Populus Nebrascensis (varieties), Fraxinus eocenica, Zizyphus 

 Jibrillosus, Bhamnus G-oldianus, Platanus Baynoldsii, Viburnum Goldianum. 



Fossil plants common to both the Lower Laramie and Denver groups : Ficus plani- 

 costata, Dombeyopsis obtusa, Paliurus zizyphoides, Artocarpus Lessigiana. 



The plants of the Livingston beds, referred by Weed and Knowlton to the Denver 

 horizon, are the following (U. S. G. S. Bulletin, No. 105, 1893). They are stated to be, 

 by Weed, from the lower 300' of the beds. Those species that occur also in the Lower 

 Laramie beds are designated by Lar. ; those in the Denver group of the Denver region, 

 by the letter D ; and those that are known from the Miocene Tertiary, by the 

 letter M : — 



Abietites dubius Lesquereux Lar. 



Sequoia Eeichenbachi Geinitz Lar, 



Taxodium distichum Miocenum Heer, 

 Ginkgo adiantoides Ung. 

 Phragmites Alaskanus Heer. 



Caulinites sparganioides Lx Lar. 



Populus mutabilis ovalis Heer._. Lar. 



" laevigata Lx D. 



Salix angusta Al. Br Lar., M. 



Quercus castanopsis Newb. 



" Godeti ? Heer. 



' ' Ellisiana Lx Lar. 



Juglans rugosa Lx Lar., D., M. 



" denticulata Lx D., M. 



" rhamnoides Lx Lar., D. 



Platanus Guillelmse Goppert. . .Lar,, D. M. 



? " aceroides Goppert. D., M. 



Ficus auriculata Lx D. 



? " tili^folia (Al. Br.) Heer. . . Lar., D. 



' ' planicostata Lx Lar., D. 



Cinnamomum Scheuchzeri ? Heer. 

 " ellipticum Knowlton. 



LitSEea Weediana Knowlton. 



Laurus socialis Lx type from Lar. 



Fraxinus denticulata Heer Lar.? 



Andromeda aifinis Lx. 



? Nyssa lanceolata Lx D. 



Rhamnus rectinervis Lar., D. 



" salicifolius ? Lx Lar. 



Celastrinites Isevigatus Ls. 



