NEW PASS MOUNTAINS. 645 



of quartzite and conglomerate, weathering- with a pecuhar yellowish-brown 

 earthy surface. On the western slopes, immediately underlying the lime- 

 stones, is a bed of purple, argillaceous roofing-slate. As exposed in Ammo- 

 nite Canon, there lies conformably above this a thickness of 1,000 to 1,500 

 feet of dark grayish-blue, compact, earthy limestones of the Star Peak 

 group, which lithologically cannot be distinguished from the Carboniferous 

 limestones. At the contact of the limestones with the quartzites is a band 

 of yellow calcareous shales. Immediately above this are dark-blue, finely 

 laminated, calcareous shales, rich in Triassic fossils, particularly in well- 

 preserved Ammonites. A second fossiliferous locality was found about 200 

 or 300 feet above the shales in a compact, fine-grained limestone. From 

 the slates of the lower horizon were obtained the following forms : 



Haldbia dubia. 

 Pteria (Avicula), sp.? 

 Pecten deformis (frag.). 

 Myacites, new sp. (very small). 

 OrtJioceras Blakei. 

 Ceratites Haidingerif 

 Ammonites Billingsianus. 

 Goniatites (Chjodonites) Icevidorsatus. 

 Ammonites (Gyinnotoceras) Blakei. 

 Ammonites Ausseanus. 



From the upper limestone beds were obtained : 



/Spiriferina Plomfrayi. 



Terebratula (minute sp., prob. new). 



Chemnitziaf 



From the limestones at the southern point of the range, near the head 

 of South Canon, were obtained also the following forms : 



Haldbia dubia. 



Haldbia (Daonella) Lommeli. 

 Modiolopsis (Modlomorphaf) ovata. 

 Modiolopsis (Modiomorpliaf) lata. 



