278 Annals of the Carnegie Museum. 



shales (green, brown, etc.). These beds are many hundreds of feet 

 in thickness. I do not know that any fossils have been found in them, 

 neither am I sure that I have observed this series in any other region 

 except near Fish Creek. 



D. Gray sandstones harder than those of C, and gray clays or soft 

 shales. In the shales, impressions of delicate plants were obtained. 



E. Dark clays and soft shales, hard laminated sandstones, and two 

 or more thin layers or lenses of limestone containing clams and fresh- 

 water gasteropods. These are the beds, which in another portion of 

 the present paper I have mentioned as occurring west of Sweetgrass 

 Creek in the region northeast of Big Timber. 



These beds A, B, C, t), and E are all well exposed on the road 

 from the McClatchy ranch to Melville and Big Timber. A and B 

 form part of the ridge through which Fish Creek cuts at the McClatchy 

 house, C forms the first large slope toward Bear Butte, D forms the 

 steeper slope, and E the high benches, ridges and depressions east 

 and north of Bear Butte. The strike of the beds here changes from 

 north of west and south of east to a more nearly northwest and south- 

 east direction, therefore the dip changes from nearly south to a more 

 westerly direction. 



These beds, on account of their stratigraphic position, must be re- 

 ferred in part to the Laramie. The lower portion contains a Ceratops 

 fauna. As is often the case, the exact upper and lower limits are un- 

 certain. A portion of the series may have been contemporaneous in 

 origin with the Livingston formation, but the rocks, so far as I have 

 observed, shows no signs of volcanic activity during the deposition of 

 the beds, unless it be the possible presence in them of volcanic ash. 



Cretaceous in Other Portions of Montana. 



With regard to the Cretaceous of eastern Montana, my personal 

 observations will not permit me to give any positive statements. In 

 the western portion I have observed the Cretaceous in many places, in 

 fact in nearly all of the larger valleys of the mountainous region ex- 

 cept two or three of the most western , but fossils are not usually 

 abundant, though some good collections might be made at the expense 

 of diligent and continued search. There are excellent exposures in 

 the following localities : (i) north of Logan extending into the Horse- 

 shoe Hills, (2) on the western flanks of the Madison and Tobacco 

 Root Ranges, (3) at the Continental Divide east of Monida, (4) in 



