FORT UNION OF CRAZY MOUNTAIN FIELD, MONT. 41 



about 900 to 1,000 feet above the base of the Fort Union No. 3 or 

 about 2,250 to 2,350 feet above the base of the Fort Union No, 1. 

 The following Princeton material seems definitely to be from tliis 

 group of locahties. 



Gidleijina monlanensis: Type, as described below; this is from Loc. 68. 



A lot including IGidUyina sp., lower premolar, a lower molar of an indeterminate 



oxyclaenine, and 3 probably associated lower teeth of Anisonchus sectorius, 



all probably from Loc. 42. 

 A badly broken lower jaw with 3 imperfect teeth, suggestive of P. cavirictus but 



not that species, perhaps not that genus, prolDably from Loc. 43. 

 Gidleyina Imontanensis: A miscellaneous lot including an M^ probably of this 



species; an isolated P4. These are probably from Loc. 60. 

 The only approximately identifiable specimen now in the National Museum and 



labeled as from these localities, a lower jaw fragment from Loc. 57, probably 



Gidleyina sp. but possibly Tetradaenodon. 



Loc. 44 is at a sHghtly higher level than those just discussed, prob- 

 ably about 200 to 300 feet. It has yielded a large lot of probably 

 associated material of Claenodon fjerox and also an upper premolar 

 probably pantolambdid but not Pantolambda. Both lots are in the 

 Princeton collection. 



Locs. 20, 61, 62, 63, 69 and 72 are also Princeton localities and have 

 yielded mammals, but I have been unable definitely to tie in any 

 identifiable specimens in the collections to these localities. 



Loc. 56.— Sec. 13, T. 5 N., R. 14 E. This is the Scarritt Quarry, 

 which occupies about this position relative to the other localities here 

 listed. Its fauna is discussed elsewhere. 



Loc. 18.— Sec. 14, T. 5 N., R. 14 E. This locaHty is nearly a mile 

 west-southwest of the Scarritt Quarry, over a gentle hill (running 

 north from Cayuse Butte), and at nearly the same level or perhaps a 

 little higher. Gidley recorded it as "about 2,000 feet below the top 

 of No. 3", and my estimates woidd place it at just about that distance 

 stratigraphically below the highest exposures on Porcupine Butte. 

 It has yielded a pantolambdid upper tooth, a lower jaw of Anisonchus 

 sectorius, and a lower jaw fragment of Ellipsodon sp. 



ioc. .r^.— Sec. 23, T. 5 N., R. 14 E.l ,,,, , ,, , ,.,. 



Loc. IS.-Sec. 22, T. 5 N., R. 14 E.f ^^though these locahties are 



about half a mile apart at their ends and are in different sections, they 

 are merely two parts of a series of shale exposures and blow-outs. 

 Material from the two marked localities has not been consistently 

 separated, nor is there any great need for doing so since they are at 

 about the same level and in a more or less continuous series of expo- 

 sures. They are high up on Cayuse Butte, or Cayuse Hills, on the 

 divide between the Sweetgrass and Fish Creek drainages. Mr. 

 Silberling has found numerous fragments on the surface here, and in 

 past years the exposure has been good, but in 1932 and still more in 

 1935 we found it in poor condition, covered with wash and in places 



