"CERATOPS beds" OF WYOMING AND MONTANA 273 



verde and separated from the Black Buttes horizon by the marine 

 Lewis shale. Lesquereux" recognized the close relationship of the 

 floras of these two localities, saying that they had 9 species in com- 

 mon. ^^ That the advance in science of the last 30 years has not 

 changed this relationship is shown by two small collections obtained 

 last year near Table Rock from the Black Buttes horizon in which 

 the following species were identified by Doctor Knowlton and referred 

 to "age probably same as at Black Buttes." 



^Viburnum marginatum Lesq. 



V. contortum Lesq. 

 *Myrica torreyi Lesq. 



Sequoia, reichenbachi (Gain.) Hear 



Sequoia heeri Lesq. 

 ^Dryophyllum subfalcatum Lesq. 

 *Ficus dahnatica Ett. 



Ficus planicostata Lesq. 



Ficus sp. 

 *Phyllites triloba Kin. 



Of the nine identified species five (marked *) are reported from 

 Point of Rocks. 



The general relations of these beds are clearly presented by A. R. 

 Schultz*^ who calls them the Black Buttes coal group. He states that 

 the Black Buttes coal group rests conformably on the Lewis shale, but 

 that the overlying Black Rock coal group is separated from it by an 

 unconformity of considerable magnitude. This unconformity was 

 not observed by Doctor Knowlton and me in 1896, but last year, in 

 company with Messrs. Veatch, Schultz, and Fisher, we visited a 

 locality a few miles south of Black Buttes, where the true relations are 

 strikingly apparent, as within a short distance the Black Rock coal 

 group overlaps the Black Buttes coal group and rests directly on the 

 Lewis shale. The beds above the unconformity contain a Fort Union 

 flora. 



As evidence of the great geographic distribution of the Black 



"Tertiary Flora, U. S. Geol. Survey Terr., Vol. VII, 1878. 



*^ Doctor Knowlton admits only 8 species in common and says of them 

 (Bull. U. S. Geol. Survey, No. 163, 1900, p. 77) "Several areopen tomoreor 

 less question, as they depend on one or two fragments. " 



*' The northern part of the Rock Springs coalfield, Sweetwater County, 

 Wyoming, Bull. U. S. Geol. Survey, No. 341, pp. 256-268. 



