GEOLOGICAL SUEVEY OF THE TEREITOEIES. 299 



19, From High Eidge, about Ten Miles West of Hot Springs. 



Hard, yellow, metamorphic sliale, fine-grained, and liard as silex; has 

 only fragments of Cinnamomum Sclieuzeri^ Heer j and Mens tiliwfoliaj Al. 

 Br. 



20. Near Yellowstone Lake, among Basaltic Books. 



Same kind of stone as the former, and harder, if possible. 



Ehamnus rectinervis, Heer. Many specimens, some of which, on 

 account of their slightly more curved secondary veins and entire borders 

 at and near the i^oint, might be referable to Ehamnus Uridani, Heer, as 

 figured in Fl. Arc, PI. xix. Fig. 7a. In our specimens^ however, the 

 veins are more curved along the borders. 



Ficus TiLi^FOLiA, Al. Br. The mere skeleton of a leaf, the primary 

 nerves only being preserved. 



POPULUS Balsamoides, (?) Gopp. A fragment, the npper part of a 

 leaf which appears to comx^lete the figure in Heer's Fl. Alas., PL ii, 

 Fig. 3. 



Equisetum limosum, Lin. Stem narrow, 4 millimeters broad, undu- 

 lately 10-ribbed, marked with sheathed articulations 10 millimeters dis- 

 tant; sheaths short, brown colored, fringed with lanceolate acute points. 

 ifke color of the sheaths may depend from the presence of oxide of iron. 

 It is, however, remarkable that all the sheaths and these parts of the plant 

 only have the same color as in JE. limosum of our time. The form of 

 the divisions of the sheaths and their length are not quite distinct, but 

 appear as in the living species, short, rigid, apxn^essed, acute, brown 

 teeth. I consider it as identical. 



Fragments of Cyperites, analogous to Gyperus angustior, Heer. 



21. Three Miles above Spring Canon. 



A kind of very hard, metamorphic, shaly limestone, with numerous 

 broken and badlj^ preserved fragments of x)lants, a few of which are 

 recognizable. 



Sequoia Eeichenbaciii, ( ?) Heer, (Fl. Arc, I, p. 83, PL xliii, Figs. 

 Id, 2&, 5a.) Branches and branchlets bearing linear-lanceolate, narrow 

 long leaves, sharply i^oiuted, decurring upon the branches by an 

 enlarged base, marked by a medial nerve, open at first, but turning 

 nj)ward near the point, or falcately curved. Upon young branchlets the 

 leaves are merely oblique and straight. Upon larger branches they are 

 open and curved, only seen at intervals, the space betvreen them being 

 marked by broad, obovate, abruptly pointed, and nerved scars of scales 

 or leaves. There is no trace of cone or of any other remains referable 

 to conifers. It much resembles >S'. Rekhenhachi, Heer, loc. eif., differing, 

 however, by its diminutive size, the leaves, branches, and scales being 

 at least twice narrower than in the specimens figured by Heer from the 

 Cretaceous formation of Kome, Greenland. It bears to S. EcicJienhachi 

 the same relation as Glyptostrobus gracillhnus, Lsqx., of the Cretaceous of 

 Nebraska, bears to G. Europeus of the Miocene. 



PiiYLLOCLADUS suBiNTEGRiPOLius, Lsqx., (Am. Jour. ScL, vol. XLV, 

 p. 92, PL iv, Fig. 8, iued.) The nervation of this species is so pecu- 

 liar that the identification of its difierent forms is certain. The leaf has 

 the point broken; its form is oval-oblong, with the borders entire from 

 the base to above the middle, where they become marked by distant, 

 obtuse, short teeth. The medial nerve is only marked at the base by ii 



