Geology and Natural History. 



ng ponu 



iiu,ilit:itive analysis showed mercuiy and sulpli; 

 titles of iron and silica. Quantitatively exaniii 

 lo\v<i:— Sulphur 13-82, mercury 85-79, iron 

 Wlu'iice its composition is 



Hor^T, 98-92; FcS„ 0-83; Quartz, Q"l 

 lA].criniont8 to determine"tlie chemical cau^^e 

 ir„porti.s between this mineral an.l cinnabar, 

 M,.„rc concludes that the mineral in (|ne-tion i 

 '■il nith the black amorphous iner( uric -nlpliir 



lehenlte end Diaphortte. — Von Zcp 

 AViss. Wien, 1871), that Freic>.l(i 

 imilar composition (A<v,Pb,Sb,S. 

 He rciaius the orioinal name lor tii 



U-7:i44; and sp. gr.=5-90. 



5. On the Eocene beds of Utah; bv T. A. (\>m:\». (From the 

 author.)— I am indebted to I'rof. Cope for an opportuniix to ex.-im- 

 mc some Eocene fossil shells, collected at A-pen >tat:<.n, :in<l at 

 Quak^n^r Asp Ridge, ea^t of liear river, Utah, at an elevation ot 

 'dO') feet These fossils were taken from the rock in which they 

 were i!ubedde<l, ],y Lucius C. Ricksecker, engine(n- on the Tacihc 

 Kailroad. They arc imbedded in Indurated clay, and Mig.not the 

 P>'ob;ihility that thev lived in a li^er rather than a hiko, especially 

 ■ 'jH'i-e is a genus of Cyrenida^ ( Velnnth'" :\reek) a^ wlU as one of 

 '•>'lulte {Anisorh,nu-hm Conrad) which li^ ed apparently m com- 

 d :\Felanli(h.'. TlK->e fo^slN arc especially 

 tee of the liuht they cn^t on the condit ion o. 

 earliest Eocene period, Thi'^ o-roup inuneui:itel\ 

 ^■^ the Cretaceous strata, and c(,rre-i)ondsM 1th the Lignite beds 

 l>a^e of the Paris Eocene and tho^e oi" ^l■o^cnce dc5=cri'.c<i 

 ithenm, which is the first Mipiacrctaccoiis gnaij. oi >trata 



