148 STANTON <fe KNOWLTON — LARAMIE AND RELATED FORMATIONS. 



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The sketch section (figure 2) from Point of Rocks 

 station four miles eastward to the line of bluffs formed 

 by the Black Buttes horizon shows the stratigraphic 

 relation and position of the fossiliferous horizons. 



If our observations and reasoning are correct, the 

 flora of Point of Rocks, which has been spoken of as 

 " somewhat different from that of any other locality 

 in the west, 1 ' is not a part of the Laramie flora at all, 

 but must be considered as older and comparable with 

 the Fox Hills plants of the Laramie plains and with 

 the Belly River plants of Canada. 



• ROCK SPRINGS. 



The coal-bearing series here exposed from the neigh- 

 borhood of the Van Dyke mine to the cliffs northwest 

 of the town has a total thickness of 2,000 feet or more 

 and may include both the Point of Rocks and the 

 Black Buttes horizons, though we did not find any 

 marine beds in the section. In ihe lower portion be- 

 low the Van Dyke coal the following plants were col- 

 lected associated with Corbula subirigonalis, M. and H. : 



Sequoia brevifolia, Lx. 

 Salve sp. 



Ficus tilixfolia, Al. Br. 

 Juglans rugosa, Lx. 



Juglans, n. sp. 

 Rhamnus rectinervis, Lx. 

 Zizyphus, n. sp. 

 Fraxinus (?), n. sp. 



Higher beds have yielded a few invertebrates, most 

 of which have a considerable range in Cretaceous 

 brackish-water strata. They are as follows : 



Ostrea glabra, M. and H. 

 Anomia micronema, Meek. 

 Modiola regularis, (White). 



Corbula undifera, Meek. 

 Melania insculpla, Meek. 



EVANSTON AND HODGES PASS. 



The Almy mines near Evanston have long been 

 known as coal producers and the geology of the neigh- 

 borhood is described or referred to in nearly all of 

 the reports cited in the preceding section. Only 500 

 or 600 feet of the coal-bearing series is exposed here, 

 and its relation to underlying beds is not shown. It 

 is overlain by coarse conglomerates and sandstones of 

 the Wasatch formation, which is probably not con- 



