FORT UNION OF CRAZY MOUNTAIN FIELD, MONT. 37 



Fort Union No. 2, or Upper Lebo 



The great bulk of the collection is from these beds. The Silberling 

 and Gidley Quarries are described and their fauna hsted in a separate 

 section of this work. The other No. 2 localities with identifiable 

 mammals are as follows: 



Loc. 51.— Sec. 24, T. 4 N., R. 15 E. This is one of the richest of 

 surface localities but has yielded no fossils in place. It is in the valley 

 of Wildcat Creek, west of the stream, about 75 feet above the base of 

 the No. 2 beds. The identifiable mammals are: 



Pucosmodon sparsus: Lower incisor. 



Ptilodus fmonlanus: Broken premolar. 



Mimotricentes angustidens: 2 isolated lower molars. 



Metachriacus provocator: Associated upper and lower teeth, 2 isolated lower and 2 



isolated upper jaw fragments. 

 Metachriacus sp: Upper tooth. 



Pidymiciis cf. haydenianus: Broken lower premolar. 

 Ellipsodon aquilonius: Lower jaw. 

 Litaletes dlsjunctus: Fragment of lower jaw and atypical but probably referable 



upper jaw. 

 Tetraclaenodon cf. symbolicus: Upper tooth, 

 Anisonchus sectorius: 4 lower jaws. 



Loc. 8. — Sec. 23, T. 6 N., R. 15 E. The exact horizon is uncertain, 

 but the locality is near Loc. 81 and probably at about the same or a 

 somewhat lower level. The only identifiable fossil is a partial upper 

 jaw of Didymictis liaydenianus. 



Loc. 24.— Sec. 2, T. 3 N., R. 15 E. This is near Loc. 25, about halt 

 a mile farther southwest, near the shore of Lake Adam, and at about 

 the same level, about 300 feet above the base of the No. 2 beds. The 

 identifiable mammals are: Associated upper and lower teeth of Meta- 

 chriacus provocator, upper tooth of Didymictis microlestes, one upper 

 and one lower jaw of Anisonchus sectorius. 



Loc. S5.—Sec. 35, T. 4 N., R. 15 E. Near the north end of Lake 

 Adam and about 300 feet above the base of the No. 2 beds. This is a 

 rich locality that yields surface material on every visit, but only one 

 specimen has been found in place and attempts to develop a quarry 

 have so far been unsuccessful. The following have been found: 



JEucosmodon sparsus: Lower incisor. 



T, , , , f All known material. 



Peuterogonodon montanus] c< . .■ ■, • .• 



. „ , , \ See systematic descriptions. 



f JJeuterogonoaon sp. K^. ' 



I Five specimens. 



Metachriacus provocator: 4 lower and 2 upper jaws (in American Museum). 



Tetraclaenodon symbolicus: 9 lower and 1 upper (the upper and 4 lower in the 



American Museum). 



Anisonchus sectorius: 3 lower and 1 upper (the upper in the American Museum). 



Loc. 60.— Sec. 9, T. 3 N., R. 15 E. Tliis is the southernmost local- 

 ity in the field, southwest of Lake Adam. The horizon cannot be 

 closely determined but is near that of Loc. 25. There is a large but 



