550 D. F. HEWETT 



Teionius, the type species of which is Anaptomorphus homunculus Cope, is 

 recoi"ded from the Gray Bull and Lysite horizons of the Bighorn and Wind 

 River basins respectively, while the closely related Absarokius is from the 

 Lysite and Lost Cabin horizons of the Wind River. The jaw appears to be of 

 a new species, somewhat more progressive than any described form of either 

 genus. 



These three specimens seem to represent a fauna intermediate between 

 that of the upper Wind River and that of Bridger B. It may belong to the 

 base of the Bridger (Hor. A), the mammalian fauna of which is practically 

 unknown, correlation with the upper Huerfano being made on a single specimen 

 of Titanothere. In any event the McCuUock Peak horizon is close to the 

 border line between the Lower and Middle Eocene. 



Dr. W. D. Matthew, who has also examined these teeth, concurs in the 

 above identifications and in the conclusions regarding the age of the beds in 

 which they were found. 



Blocks, bowlders, and smaller fragments of dense cream to buff 

 limestone are found on the summit of Middle Peak, as well as on 

 the ridge that extends south and in the ravines cut below it. In 

 an area on the summit about 600 feet square, there are no less than 

 twenty blocks riiore than 3 feet in maximum dimension, and the 

 largest is 5X5X10 feet. Most of the blocks are rudely rectangular 

 and appear to be bounded by bedding planes and joints, although 

 the surfaces are pitted and grooved by the solvent action of water. 

 The blocks are irregularly distributed and there can be no doubt 

 that they are not in place. The size, shape, and composition of 

 the blocks as well as their distribution, are similar to those described 

 by Granger and Sinclair (9a), to which a glacial origin was 

 ascribed. Fossils collected from one of the blocks have been 

 examined by Dr. George H. Girty, who reports that the following 

 species are present: Cliothyridina, crassicardinalis, Eumetria 

 Verneuliana, Schuchertella off. Chemungenis, Spirifer centronatus, 

 Triplophyllum sp. Dr. Girty states that this is a characteristic 

 Madison fauna (Mississippian) . 



This collection may be compared with the following collection, 

 also identified by Dr. Girty as belonging in the Madison lime- 

 tone. It was obtained about 50 feet above the southwest base 

 of the block of limestone that forms Chalk Mountain^ west of 

 Cody, where it overlies beds of Cretaceous age: Triplophyllum ex- 

 cavatum, Schuchertella af. Chemungensis, Camarotoechia metallica ( ?) , 



