284 GEOLOGICAL SUEVZY OF THE TEEEITOEIES. 



is a single small oval leaflet. 12 millimeters long. 6 millimeters broad, 

 rounded to the point and to tlie base, with narrow but distinct medial 

 nerve, and secondary veins. oblic|ne. slightly arched to the borders, 

 forking twice. The base of the nerve is abrnptly bent to one side, as if 

 it had been joined to a main rachis. or as a lobe of a comj^ound leaf. 



PHEAG^niES OE^^^N'GE^■SIS. Al. Br. Eepresented by broken stems, 

 with distinct nervation, obscure articulations, and scars of branches 

 bearing the characters of this species. 



Fragments referable to the genus Cyperites and to the genus Calam- 

 02)sis, [I) as described in my former report. loc. cit.. j). 3SJ:. 



2. ]Mrx)DY Ceeek Jl>"t» Blaex's Foee. 



Xo remains of other species but of those described in the former 

 report have been discovered in the examination of new specimens of 

 these localities. Aspidium, named A. pidcheUum, or A. Fisclieri, Heer, 

 belongs to this last species; and as far as can be ascertained from frag- 

 ments of glumaceous leaves, the species considered as Carex t€i'tiaria^{\) 

 Heer, loc. cit., ]). 3S4, is right. 



■ 3. Baeeeel's Speixgs. 



The matter imbedding fossil remains of this locality appears under 

 three different aspects : 1st. A ferruginous, reddish, hard clay-shale, 

 with few remains of trees, Sequoia^ Acer. 2d. A soft, laminated shale, 

 passing downward to layers of coaly matter, formed of broken pieces 

 of grasses, ferns, «S:c., all herbaceous plants, with floating rootlets. 

 3d. A soft, yellow clay, apparently a bottom clay, with roots of Equise- 

 tacece. The succession of deposits from bottom upward is marked by 

 the substance of the shale as by the kind of plants which they have 

 X^reserved. 



LYGODir^i yEniOPTEEOEDES. Lsqx. (Dr. Hayden's Eeport, 1S70, 

 p. 384.) Separate leaflets only, with fragments of stems of the same 

 species, are abundant in the shales. Leaflets bifid, trifid or quacUifid, 

 with linear lanceolate obtusely pointed divisions. 4 to S decimeters long, 

 from the obconical base of the leaflets to the point of the longest lobes. 

 The leaflets are divided, from below the middle, in lobes irregular in 

 size, the lateral ones being generally shorter, all obliquely diverging 

 with more or less obtuse sinuses and entire or slightly wavy on the 

 borders. Sometimes they are enlarged at the point and emarginate in 

 two short, obtuse lobes. The nervation is simple for each di\isiou of 

 the leaflets, the medial nerve of each remaining distinct to the base 

 and there, being separated by secondary flabeUate veins, which higher 

 up come out from the medial nerve in a very acute angle, and remain 

 nearly parallel to it before curving to the borders. The lowest veius 

 are three to four times dichotomous, the superior ones only twice, and 

 so close are they to each other that, along the borders, 75 to SO veiulets 

 are generally marked in one inch. The areas are lilled by square or 

 pentagonal areoke, very small but distinct. As yet few fossil species 

 have been referred with sutflcient evidence to this fine genus. Lygodi- 

 um crefaceum. Debey and Etting., is from the Cretaceous formations of 

 Belgium. Fuur other species are described by Heer, from the Miocene 

 of Switzerland, and one from Oeniugen. 



Eqeisetuzm Haydexh, sj). jiov. Bhizoma, IJ to 2 decimeters broad, 

 irregularly striate, articulated : articulations 'distant, bearing round 

 obovate tubercleSj 14 millimeters broad, 2 centimeters long, attached S to 



