286 GEOLOGICAL SURVEY OF THE TEREITORIES. 



structiu^e of the stem. Xo remains of leaves, fruits, or floTvers Lave been 

 found in connection ^ritli the fragments of stem, and therefore the 

 species is undetermined. It may be referable to Sjjarganium VaJdense, 

 Heer, which it resembles by the nervation and the mode of branching, 

 as seen in Fl. Tert. Helv., PL xlvi. Fig. 6 h. 



ACEE, species. Is represented, like the former, by a single fragment 

 too incomplete for specific determination. The round, cordate base 

 only, with a small part of the middle of the leaf and its nervation, is 

 preserved. It appears to be of the same type as Acer Sismondcc, Gaud., 

 (1st Mem., PL 13, Fig. 1,) agreeing with this last figure for the outline 

 of the leaf and for the nervation, and by its size comparable to Fig. 21, 

 PL i, of the 1th Mem., of the same author. I mention this leaf because 

 it is the only fragment of an arborescent dicotyledonous species i)reserved 

 on the shale of this locality. 



4. Elko Station. 



A yellowish white calcareous fine-grained shale, hardened by meta- 

 morphism. Plants preserved in broken, small, mixed fragments. 



Phrag^htes OENI^'GE^'SIS, Al. Br., in numerous fragments of leaves, 

 stems, and rhizomas. 



Poacites LffiYis, Heer. Eepresented like the former, by a great num- 

 ber of broken leaves, with smooth surface, often without trace of veins. 

 The blades are mostly narrower than in the figures of this species, in 

 Heer's loc. cit.; intermediate in width between those of Poacites loevis 

 and P. augustiiSj Heer, (Fl. Ter. Helv., PL xxvi, Fig. 7 a and &,) or even 

 as narrow as in the last-named species. 



QuERCUS semi-elliptica, Gopp., (Schossnitz, FL, p. 15, PL vi. Figs. 

 3, 1, 5.) There are four specimens of this species, one of which only 

 represents an entire leaf with all the specific characters. The form 

 of the leaf, with its slightly unequal base, the nervation, the teeth of 

 the borders, are exactly similar to Fig. 3, Joe. cit. The leaf is only smaller, 

 half an inch long, one-fourth of an inch broad. Of the other specimens, 

 all fragmentary-, one only indicates a somewhat larger leaf. Professor 

 Heer refers (Fig. 4, quoted above) to Flanera linger i ; and, indeed, our 

 specimens much resemble some forms of this polymorphous species, and 

 might be referred to it but for the base of the leaves narrowed to the 

 petiole by a short curve. The nervation, also, is somewhat different, 

 the secondary nerves branching often downward above the middle, as in 

 species of Ulmus, and the lowest secondary veins curving near the bor- 

 ders and along them, though their angle of deviation is about the same 

 (10^) as in the upper ones, which go straight to the point of the teeth. 

 The veins and veinlets are flat and deep, nervilles not quite distinct, but 

 marked as i^erpendicular or oblique to the veinlets. 



5. Washakie Station near Bridger's Pass. 



A calcareous and arenaceous stone, hardened by metamorphism, dark- 

 gray, irregularl}' breaking. Eemaius of plants preserved in large distin- 

 guishable fragments, sometimes rolled or even flattened in a direction 

 crossing the horizontal layers of the stone. 



EHA3INUS iNTERiMEDius, sj). uov. Leaf G ccutimeters long, not 

 quite 2 centimeters wide, narrowly oval, lanceolate and oblanceolate, 

 with entire margins tapering downward to a short petiole, (:) (petiole 

 broken,) medial nerve half round, strong, secondary veins oblique, (33^,) 

 close to each other j 16 i>airs from base to point, thick, curving near the 



