FORT UNIOX OF CRAZY MOUNTAIN FIELD, MONT. 35 



not carried out until 1935, when the Third Scarritt Expedition opened 

 a quarry here and made a collection of about 50 jaws and numerous 

 teeth and odd fragments. The locahty is in SE)^NWK sec. 13, T. 5 N., 

 R. 14 E., on the eastern slope of the low divide or spur that extends 

 northward from Cayuse Butte. The horizon is estimated to be about 

 2,000 feet above the base of the No. 3 beds, hence about 2,150 feet 

 above the Gidley Quarry and about 3,350 feet above the base of the 

 recognized Fort Union of this area. As it is quite impossible to 

 measure a continuous section between any of these datum planes, the 

 horizon is approximate only but is probably of the right order, and 

 the quarry is unquestionably much higher stratigraphically than the 

 other quarries, and the highest in the field from which much identi- 

 fiable material has been found except for Locs. 11 and 13, which are 

 clearly higher, probably by about 1,000 feet. 



The fossil level is marked by a bed, varying from a mere film up to 

 about 4 inches in thickness, almost entirely composed of shell frag- 

 ments. Mammals occur in this shell bed, and also in the clay (with 

 more scattered and more complete shells) within 2 or 3 inches of it, 

 both above and below. As far as the bone pocket has been followed, 

 it is much less rich than the Gidley Quarry, but the material is good 

 in average preservation and association of upper and lower jaws is 

 relatively much more frequent than in the other quarries. (Four 

 instances of association occur among the 50 jaws collected here, while 

 such association has so far been found only once in the Silberling 

 Quarry and once in the Gidley Quarry.) The fauna so far collected 

 is as follows: 



Ectypodus hunteri: 2 upper and 4 lower jaws and 27 isolated teeth. 



Ptilodontid undetermined: 1 tooth. 



Leptacodon cf. tener: 1 lower jaw. 



Bessoecetor thomsoni: 3 upper jaws, 9 lower jaws, and 1 specimen with associated 



upper and lower jaws. 

 Cf. Palaeosinopa sp.: 1 tooth. 

 Elpidophorus patratus: Associated upper and lower jaws, 1 upper jaw, 1 lower 



jaw, and 5 isolated teeth. 

 Unuchinia asaphes: 1 lower jaw. 



Plesiadapis anceps: Associated upper and lower jaws and 6 isolated teeth. 

 Carpodaptes hazelae: 1 upper and 3 lower jaws. 

 Phenacoleniur frugivorus: 1 lower jaw. 

 Cf. Chriacus sp.: 1 tooth. 



Litolesles nolissimus: Associated upper and lower jaws and 19 isolated lower jaws. 

 Tetraclaenodon sp.: 1 upper molar. 

 Pantolambdid undetermined: 2 broken teeth and parts of limb bones. 



OTHER IMPORTANT LOCALITIES 



The following are faunal lists for and some notes on localities other 

 than the three quarries that are of some importance. They include 



