GEOLOGICAL SURVEY OF THE TERRITORIES. 383 



generally obliterated. I could, moreover, dispose of but a short time 

 for researches iu a locality which had been sufScfently explored by Dr. 

 Haydeu and other geologists. The few specimens got there rei)reseut 

 the following species : 



Phragmites Oeningensis, A1. Br. 



In numerous specimens. 



Flabellaria zinckeni, Heer. 



The same form and characters as the si)ecimens of Golden referred 

 to this species. 



QUERCUS CHLOROPnYLLA, Ung. 



A number of specimens of the same species which I considered as 

 identical with this Quercus, iu my examination of the fossil plants of 

 Dr. Leconte, in Am. Jour, Sci. and Arts, (18G2,) p. 200, and was de- 

 scribed and figured under this name in Proc. Am. Phil. Soc, vol. xiii, p. 

 413, PI. xvii, Fig. 5 to 7. These leaves are of a coiiaceous substance 

 and have scarcely any trace of secondary reins marked on the surface ; 

 their relation is undefined. The Marshall's leaves are slightly more 

 rounded to the petiole than those of Mississippi. 



CmNAMOMUM AFFINE (?), Lsqx., Am. Jour. Sci. and Arts, (1868.) p. 206. 



The specimens are not distinct enough to ascertain if they represent 

 this species or Cinnamomum Missinnipiense^ Lsqx. 



The main coal of Marshall's is mixed near the bottom with large fossil- 

 carbonized trunks, which, by cleavage, appear as cut by the ax. The 

 same are found, too, in the same circumstances at the Canon City coal- 

 bed. 



Erk Mines, Boulder Valley. 



The soft, sandy shale overlying the lignite-bed is full of finely pre- 

 served vegetable remains. But this shale is left in the mines for roof, 

 or when taken out it is soon crumbling into small fragments under 

 atmospheric influence. By the kindness of the superintendent, Mr. Hill, 

 I got from the mines a few pieces of shale, which, as seen from the fol- 

 lowing descriptions, indicate the richness of the flora of that locality. 

 Further explorations should be pursued in the mines, or in the opening 

 of a new tunnel, with suiScient authority to obtain fresh slabs from the 

 roof shales. 



Sabal CampheUii f?J, Xewb. 



A number of fragments of rays of a Sabal, probably referable to this 

 species. The shale being soft-grained and the specimens distinct, the 

 striae of the rays are distinguishable and may be counted. They are 

 very thin and close, like mere woody fibres, 30 in a width of 3^ mill. 

 The rays between the plicatures are 16 mill, wide, and have, therefore, 

 about 150 of these line';. They are all of the same thickness. 



