■Veatch — Localities of Supposed Jurassic Fossils. 459 



and Hall, quoted above, the locality which furnished the 

 leaves was determined to be on the south bank of Little Muddy 

 Creek, about one mile east of the present town of Cumberland. 

 A considerable collection of plants of the same type was 

 obtained from just north of the creek, and studied by Dr. 

 Knowlton, who reports as follows : 



" Plants from Sec. 29, T. 19 K, K. 116 W. One mile E. 

 of Cumberland. 



Gleichenia. Two or three species, well preserved. 



Equisetum? sp. Peculiar, probably new. 



Aralia, cf. A. Saportana. 



Dewalquea, near I), insignis. 



Peculiar radiate plant of unknown affinity. 



u This is extremely interesting material as it is evidently 

 from the same locality Or, horizon as that at which Fremont 

 obtained a small collection in 1812,. which was worked Up by 

 James Hall, who referred the beds to the Jurassic. The ferns 

 here called Gleichenia were named Pecopteris by Hall, but they 

 seem indistinguishable from this modern genus. The age, so 

 far as I am able to fix it, is the lower part of the Upper Cre- 

 taceous, about in the position of the Turonian, possibly a little 

 lower." 



This horizon is stratigraphically 1,200. feet below the thick 

 sandstone, which here forms the very prominent topographic 

 feature known as Oyster Ridge. The geological position of 

 the plant-bearing beds, as determined by stratigraphic data 

 and invertebrate fossils identified by Dr. T. W. Stanton, is 

 clearly Benton or lower Colorado. The leaf-bearing beds are 

 underlain by black shales containing abundant fish scales, 

 which were observed by the early explorers near Aspen, and 

 which they correctly referred to the Benton. These fish-scale 

 beds are underlain by the fossiliferous Bear River formation. 

 The coal-bearing series containing the fossil plants yield at 

 many points invertebrates with distinct Benton characteristics, 

 and about 3,000 feet above the Oyster Ridge standstone nu- 

 merous specimens of the characteristic Niobrara form, Inocera- 

 mus exogyroides, were found. 



The invertebrates described by Hall as Cerithium nodu- 

 losum and Turbo paludinqformis* came from the bluffs 3 or 

 4 miles east of this locality, which here present a scarp face 

 capped by- this fossiliferous, somewhat oolitic limestone. 

 These beds dip gently eastward, and it was clearly Hall's 

 unwarranted assumption that both the plant-bearing beds and 

 the oolitic limestone had the same dip that led to the conclu- 

 sion that the fossils came from a lower horizon than the leaves. 



ssils came irom a lower Horizon 

 *Ibid., p. 309, pi. iii, figs. 11, 12, VS. 



