46 



BULLETIN 16 9, UNITED STATES NATIONAL MUSEU^^I 



FAUNAL SUCCESSION AND CORRELATION 



COMBINED FAUNAL LIST 



Table 3 lists all the genera and species of mammals so far identified 

 in this field, with the approximate level in the Fort Union series at 

 which each is known to occur. The only omissions are a few speci- 

 mens of uncertain level. They include no forms not otherv.-ise recorded 

 here but might have extended the vertical distribution were their 

 horizons accurately known. 



The list incidentally emphasizes the extraordinary richness of this 

 field and its known faunas. It shows the presence of 51 genera (5 

 tentatively identified, but different from the 46 definitely known) and 

 79 species (15 tentatively identified or now nameless, but different 

 from the 64 definitely known and named). The field is richer in 

 variety of fossil mammals than the Puerco and Torrejon together, 

 indeed almost as rich as all the other North American Paleocene 

 combined. 



The figures given for each column are the approximate stratigraphic 

 levels in feet above the base of the Fort Union No. 1. In the 575 

 column, fossils from Loc. 51 are listed. The 800 column mcludes 

 Locs. 24, 25, 50, and 81. The 1,150-1,200 column includes Locs. 

 5, 6, and 54 and the Gidley Quarry. The 1,265 is the Silberling 

 Quarry. The 1,350 includes Locs. 35, 53, and 82, and 1,700-1,750 

 is Locs. 12, 27, and 28. The "Princeton localities" are included in 

 the 2,250-2,350 column, and Loc. 18 and the Scarritt Quarry in the 

 3,350-3,500 column. The last column, 4,350, is for Locs. 11 and 13. 



Table 3. — Combined faunal list, Crazy Mountain Field, Mont. 



Species 



No. 1 



(At 



level 



shown) 



No. 2 



575 

 feet 



800 

 feet 



1,150- 

 1,200 

 feet 



1,265 

 feet 



No. 3 



1,350 

 feet 



1,700- 

 1,7.50 

 feet 



2.250- 

 2,350 

 feet 



3,350- 

 3,500 

 feet 



4.350 

 feet 



PtUodus montanus 



fPtilodus douglassi 



f PtUodus gidleyi 



fPtilodus sinclairi.. 



PtUodus sp.- 



fEciypodus grangeri.. 



tEctypodus Tusselli 



fEctypodus sUberlingi 



Ectypodus hunleri 



fParectypodus jepseni 



Eucosmodon sparsus 



Gelastops parcus 



Prodiacodon concoTdiarcensis. 



Leptacodon tadae 



Leptacodon munusculum 



Leptacodon cf . tener 



35 



