FORT UNION OF CRAZY MOUNTAIN FIELD, MONT 



55 



far up into the No. 3, even higher than the Scarritt Quarry, is less 

 dependable but suggests the same conclusion. It is also suggestive 

 that the age difference between the Gidley and Silberling Quarry 

 faunas, which are very close to the Torrejon in age, and that of the 

 Scarritt Quarry appears to be less pronounced than the age difference 

 between the Torrejon and the Tiffany. 



The Scarritt Quarry and equivalent levels may be correlated with 

 the Tiffany, with the reservation that it is possibly a little earlier, 

 and may be placed in the earUest Upper Paleocene. The highest 

 faunal level, that of Locs, 11 and 13, is likewise surely Upper Paleo- 

 cene, probably about Tiffany. 



The lower levels in the No. 3 cannot be well correlated on present 

 data. They are bounded by Torrejon and (probably early) Tiffany 

 equivalents. There is some slight evidence that they are in fact 

 transitional between these two and represent most of the gap in 

 time known to exist between Torrejon and Tiffany, rather than being 

 more definitely associated with one or the other. If there is a dis- 

 tinct faunal break in this series, it would be logical to look for it at 

 the most obvious change in sedimentation, at the base of the No. 

 3. The scanty fossil evidence does not warrant such a positive 

 conclusion. The only known elements in the basal No. 3 that look 

 toward the later faunules are Claenodon fjerox of little or no value, 

 since this is, in fact, a typical Torrejon species, and Gidleyina, which 

 is more suggestive but in itself far from conclusive. 



• Dr. Jepsen has not yet applied valid stratigraphic names to these levels, distinguished by him. 

 119212—37 5 



