388 GEOLOGICAL SURVEY OF THE TEERITOEIES. 



characters, and there are still at Carbon and other localities a few rem- 

 nants of the lower Li gnitic flora : Ralymenites major, Smilax grandifolia, 

 Gauiinites Sparganioides, Ficus tilicefolia, especially Cinnamomum Missis- 

 sippiense, and a variety of Bhamnus Goldianus. But of the 56 species of 

 the group, 31 are identified with species of the Euroj^ean Miocene, or of 

 the Arctic flora. Of these last it has 13 species, or 23 per cent., four of 

 them already counted in the Evanston division : Acorns bracJiystachys, 

 Populus arctica, P. decipiens, Querents platania, Q. Olafseni, Goryliis Mo- 

 Quarryi, Fagus anfipofi, Vitis Islandica, Magnolia Inglejieldi, Paliurus 

 Golombi, Zizyphns liyperhoreus, Juglans denticulata, and Garpolithes coc- 

 culoides. The Miocene fades of the flora of this division is equally well 

 marked in species of its own or American species, like Equisetum Hay- 

 denii, Betula &tevensoni, Ficus Gaudhii, Goccoloha Icevigata, Asimina 

 miocenica, Zisyplms MeeMi, &c., all species evidently of more recent types 

 tiian those of the two lower groups. The relation of this division with 

 No. 2 is, however, indicated by 17 identical species, more than one-fourth 

 of the whole number, while it is allied to the upper group only by a few 

 of the omnipresent species, Taxodium duhium, Phragmites (Eningensis, 

 Juglans acuminata, J. denticulata, and by only two species, Equisetum 

 Haydenii and Ficus lanceolata, not recognized in the lower groups. 



The plants of all the localities referred to this division are of the 

 same type. But the specimens labeled Point of Rocks and Eock Creek 

 have apparently been mixed, or indicate different localities than those 

 which now bear these names. The Point of Eocks station is lower in 

 the measures than Black Butte, and its flora should have the Eocene 

 character, of course. But I could not find any remains of plants there 

 or around in that barren country, though I spent two days in searching 

 for them. The Eock Creek station is Cretaceous, and for miles around 

 I found there nothing but representatives, in rocks and fossil animal 

 remains, of the two upper groups of this formation, to fifteen miles 

 farther west than Medicine Bow, where heavy sandstones of the Ter- 

 tiary are covered by the lignite deposits of carbon. 



LIST OF THE SPECIES OF THE FOUETH GROUP. 



[Abbreviations for names of localities: B. Sp., Barrel's Sprinjif; Hy. F., Henry Fork; 

 Gr. R., Green River ; S. P., South Park ; M. P., Middle Park ; £1., Elko ; M. Cr., Muddy 

 Creek; Mo., Miocene; Gr., Group.] 



Hemitelites Torelli(?), Heer.— Gr. E. 



Pteris pennaeformis, Heer. — Hy. F.— Mo., (Gr. 1.) 



Blechnum Gcepperti, Ett. — Hy. F. 



Aspidium Fischeri, Heer. — M. Cr. — Mo. 



Lygodium neuropteroides, Lesqx. — B. Sp. 



Ophioglossum Alleni, Lesqx. — S. P. 



Salvinia cyclophylla, sp. nov. — M. P. 



Lycopodium prominens, sp. nov. — El. 



Equisetum Haydenii, Lesqx. — B. Sp., (Gr. 3.) 



E. Wyomingense, sp. nov. — Gr. E. 



Taxodium dubium, St.— El.— Mo., (Gr. 3.) 



T. tijanorum, Heer. — B. Sp. — Mo. 



Glyptostrobus Europeus, Heer. — S. P. — ^Mo. 



Sequoia angustifolia, Lesqx. — El. 



S. Langsdorfi, A. Br.— S. P.— Mo., (Gr. 1.) 



S. Coutsise(?), Heer.— M. P.— Mo. 



Thuya Garmani, Lesqx. — El. 



Thuites callitrina, U.— S. P.— Mo. 



