124 Cretace&us. 



lignitic coal. The rocks are well exposed on Green river, about twO' 

 and a half miles above Flaming Gorge; along the northern flanks of 

 the Uinta mountains; in the Pink cliffs; at Givnnison's Butte, on 

 Green river south- of Gray canon, but especially in the cliffs and es- 

 carped hills of the Salt Wells basin, east of the debouchure of the 

 Point of Rocks canon. 



The Point of Rocks Group consists of sandstones^ usually indur- 

 ated, sometimes ferruginous, with many beds of carbonaceous shales 

 and lignitic coal, and is divided into the Golden Wall Sandstone, the 

 Middle Hogback Sandstone, and the Upper Hogback Sandstone. The 

 rocks are well exposed at Point of Rocks Station on the Union Pacific 

 Railroad, in the escarpments facing Bitter Creek, at Rock Springs^ 

 on Green river, 2 miles above Flaming Gorge, at the foot of Desola- 

 tion Canon, and Gray Canon on Green river, in the Wahsatch Cliffs 

 at the head of the Escalaute river, and in the bills at the foot of the 

 Pink Cliffs in Southern Utah. 



Prof. C. A.White* described, from the Point of Rocks Group, near 

 Point of Rocks, Wyoming, Ostrea insecura, Odontohasis huccinoidea ;. 

 from Upper Kanab, Utah, Unio gonianotus, Planorbis kanabensis, 

 Physa kanabensis^ Helix kanabensis ; and from Bear River Valley, 

 near Mellis Station, Wyoming, Rhytophorus 7neeki, Goniobasis cle- 

 burni, G. chrysaloidea, Viviparus panguitchensis ; from the Salt Wells 

 Group, near Coalville, Utah, Ostrea sannionis, Area coalvillensis, 

 Lxinatia utahensis; from Last Chance creek, Southern Utah, Inocera- 

 mus gilberti; and from Upper Kanab, Utah, and Hilliard Station, 

 W3-oming, Cyrena ei^ecta. 



He described, from the Sulphur Creek Group at Upper Kanab, Utah, 

 Turnus sphenoidens, Anchura rvida, and A. prolabiata. 



He described from the Henry's Fork Group at the head of Water- 

 pocket canon. Southern Utah, Plicatula hydrotheca; from Lower 

 Potato Valley and Upper Pine creek, Utah, Inoceramus hoiveUi; from 

 Middle Park, south of Grand river, Colorado, Avicula parkensis. 



He described, from the Bitter Creek Group at Black Buttes, Wyoming, 

 Unio petrinus^ TJ. propheticus, U. brachyopistJius, Keritina volvi- 

 lineata, Viviparus plicapressus. Leioplax turricula; from Almy coal 

 mines, near Evanston, Pisidium saginatum, Hydrobia recta; from 

 Point of Rocks, Corbula subundifera; from south base of Pine Valley 

 Mountains, Utah, Helix ^:>er^■p^eria, and from Musinia plateau, 

 Hydrobia utahensis. 



''■' Geo. of Uinta Mountains. 



