Mineralogy and Geology. 121 
shall Group is in stratigraphical position really below that formation. 
The investigations in the more western States tend to confirm this view. 
The number of species that have been described from the rocks is about 
379, 170 of which were first described by Prof. Winchell. The present 
paper contains descriptions of 94 species, 36 of them new. 
6. On a few of the Fossiliferous localities in Livingston and Genesee 
Counties, V. Y.; by Henry A. Greex.—(Communicated for this 
Journal.)—To reach one of the best localities of the Portage group, in 
this region, proceed about a mile up the ravine of Buck Run, from 
? 
lerophons, Goniatites, and several other species of Mollusca. 
A little farther up the ravine, I found, at one time, a portion of a fossil 
plant. The part obtained was nearly a yard long, from two to four 
inches in width and about half an inch thick. There is but little coaly 
Matter about it, the larger part consisting of pyrites and shale, i 
At Gibsonville, a few miles west of our village, I have found quite a 
number of these plants. One of these I traced some six or seven feet. 
It was about four inches wide, and one-fourth of an inch thick, and was 
showing the arms, has be ti A large portion of this specimen 
: s, has been wanting. ge p ) 
18 nearly perfect; it shows the forms and markings of the large plates of 
AM, Jour. Sct.—Szconp Series, Vor. XLI, No. 121.—Jan., 1866. 
i es 
