42 BULLETIN 169, UNITED STATES NATIONAL MUSEUM 



tending to sod over. Efforts have been made to find a bone level or 

 develop a quarry, but so far no material has been found in place. 

 This series of exposures is important as the highest in this field from 

 which identifiable material has been recovered. The level is about 

 3,000 feet above the base of the No. 3 beds. The National Museum 

 specimens available are: 



Plesiadapis rex: Type and referred material, as described below. 



Cf. Paromomys, genus and species undetermined: An isolated upper tooth. 



IGidleyina superior: Type lower jaw. 



Teiradaenodon sp.: 2 upper molars. 



To this Ust may be added the follomng forms in the Princeton 

 collection. Their derivation from this level seems to be estabHshed 

 with sufficient probability: 



Multituberculate undetermined: 2 broken premolars. 

 Elpidophorus Ipatratus: Lower molar. 

 ClaenodoH cf. ferox: 2 upper teeth. 

 Thryptacodon cf. australis: Lower molar. 

 Hyopsodontid aff. Haplaletes: M^-^. 



Loc. 49.—'NW%'NWy4 sec. 23, T. 5 N., R. 14 E. This is near 

 Logs. 11 and 13 in position and also stratigraphically. According to 

 Mr. SilberHng, Princeton no. 13756, numerous tooth and jaw frag- 

 ments of Claenodon fferox, came from here. 



Loc. 66.— Sec. 14, T. 5 N., R. 13 E. This is a very high exposure, 

 at least 750 feet stratigraphically above Loc. 13, on the east flank of 

 Porcupine Butte, about one-third of the way up that butte. It is a 

 small shale exposure, important only as the highest level in this 

 field where mammal fragments have been found. It is also con- 

 siderably the most western mammal locality in the field. The 

 material collected was, Mr. Silberling informs me, definitely mamma- 

 Han, but probably was not identifiable and no specimens bearing this 

 locaUt}^ datum were found in the collection. 



Horizon Uncertain 



Here may be mentioned two Princeton specimens that are of too 

 uncertain provenience for present inclusion in the more precise Hsts 

 or for use in correlation. 



No. 14191 includes two upper molars of a small Claenodon, com- 

 parable to C. silberlingi, collected July 3, 1903, labeled as from the 

 Torrejon, "Anderson's Big Timber Road", a designation too vague 

 to indicate any particular horizon or locality. 



No. 13757, December 1902, "Loc. No. 9 Puerco", is probably from 

 the Fort Union No. 1, since the No. 2 was known to be of Torrejon 

 age by the Princeton parties and the No. 1 considered as Puerco. 

 Loc. 9 of Silberhng's series is in the No. 1, but since the Princeton 

 parties did not use these numbers this is probably only a coincidence 



