FAUNAL EVIDENCK AND CORKELATIOlf. 239 



onlj^ two .species of which, however, remain. The stratigraphic horizon appears to 

 be in the Maroon cong-lomerate, and the fauna mentioned by Stevenson agrees rather 

 with that of the lower member of the Maroon than with the Weber. But, as I have 

 already pointed out in the stratigraphic division of my report, the occurrence in the 

 middle of Stevenson's section of duplicated Cretaceous beds inspires a doubt as to the 

 mutual I'elations of the rest of the section. 



The material from station :^24.j appears to have been collected by W. H. Holmes, 

 but there is evidently a mistake in the localit}' given in the National Museum Regis- 

 ter, and I can find no published section with which it is connected. The locality, 

 though uncertain, is with great probability in the Elk Mountains. The evidence 

 of the fauna would tend to place the horizon of this collection in the Maroon 

 conglomerate. 



Station 2280 is in the section made by Peale at a point southeast of Italian Peak, 

 described on page 251 of- the [Seventh] Annual Report of the United States Geologi- 

 cal and Geographical Surve\' of Territories for 1873, 187rt. The collection, which 

 includes six species, comes from bed No. 11 of the section, and Reale cites the same 

 forms under different but synonymous names. The stratigraphic horizon is clearly 

 in the Maroon series, and the fauna also agrees with that of the lower Maroon. In 

 the final colmuns of the table, which show the composite faunas of the Weber and 

 Maroon formations, stations 2244 and 22S0 but not 2245 are included. 



SOUTH PARK AREA. 



Just as in the Elk Mountain region practically all the collections studied came 

 from a limited area, that of the Crested Butte quadrangle, so in the South Park 

 region all the fossils examined were obtained in its northern portion, the Leadville 

 district. 



The localities represented in the accompanying table aie 31 in number, and are 

 chiefly in the Tenmile and Leadville districts. The Tenmile district lies between 

 meridians 106"^ 8' and 106^ 16' 8" W.. and parallels 39^^ 22' 57" and 39*^ 30' 25" N. 

 It does not strictly form a part of the South Park region. The ar^ a of the Leadville 

 district is somewhat less precise, but includes the mineral-bearing tract near Lead- 

 ville, in the northern part of the Mosquito Range. 



The geology of the Tenmile district is described in the Tenmile folio" and that 



of the Leadville district in the Leadville monograph.'' The areas of the Tenmile and 



Leadville districts are geographically almost continuous. The same rocks occur in 



both, and the geology of both was described by S. F. Emmons. It has therefore 



.seemed to me best to consider the faunas of both areas in the same place. 



o U. S. Geol. Surv., Geol. Atlas U. S.. folio 48, 1898. 

 6 U. S. Geol. Siirv., Men., vol. 12, 1886. 



