346 T. W. STANTON INVERTEBRATE EAI'NA OF THE MORRISON 



Park probably also belong in this fauna. The only species that suggests 

 a Morrison form is the Viviparus. The other gastropods, and the Union 

 especially, are very distinct from those of the Morrison. The evidence 

 of the invertebrates, therefore, is opposed to Professor Berry's*' suggestion 

 "that this general horizon in the Eocky Mountain area has been regarded 

 as Morriso]] Avhere it contains vertebrate remains and Kootenai where it 

 contains plant remains." 



It is still questionable whether Fisher and C^alvcrt wnc justified in 

 identifying the Morrison beneath the Kootenai in ]\Iontaiui. and it may 

 be that the beds which they so identified really form a basal member of 

 the Kootenai, as Fisher suggested. The dinosaur bones collected from 

 tills part of the section were not well enough preserved for even generic 

 identification, and fragments of bone were found at different horizons 

 throughout the overlying Kootenai formation. Tn this connection I call 

 the attention of vertebrate paleontologists to the fact that the Carnegie 

 Museum at Pittsburgh has a collection of dinosaur bones obtained by 

 Hatcher from supposed Kootenai at the locality near Harlowton, Mon- 

 tana, which yielded the invertebrates here listed, and it may be that there 

 is another collection of them at I'rinceton University. Possibly these 

 are good enough for determining whether or not they are distinct from 

 Morrison forms. That post-Morrison formations do contain dinosaurs 

 related to those of the Morrison is shown by the occurrence of IToplito- 

 saurus and Camptosaurus in the Lakota near Buffalo (lap, South Dakota, 

 as recorded by Gilmore.' For this reason the finding of a bone of an 

 unidentified saui-o])od dinosaur in the Comanche series of Oklahoma has 

 never seemed to me very strong evidence that the Morrison is of Co- 

 manche age. If some groups of Morrison diiiosaiii's ranged into later 

 formations, the sauropods also may luive had a greater vertical range. 



BEAR RIVER FAUNA 



The Bear Pivc-r fauna occurs in a thick formation at tlie base of the 

 Upper Creta;ceous in southwestern Wyoming. It is a large and greatly 

 varied fresh-water fauna, with a few brackish-water species, which has 

 been fully described by C. A. White.* It shows no relationship with the 

 Morrison fauna other than a few conmion genera, and its resemblance to 

 the Kootenai fauna is but little closer. 



'E. W. Berry: Lower Cretaceous, Maryland Geo). Survey, 1911, p. 164. 

 ■^ C. W. Gilmore : Proc. TT. S. National Muspud). vol. .36, 1909, p. 300. 

 * C. A, White : The Bear River formation and its characteristic fauna. U. S. Geol. 

 Survey Bull. 128, 1895. 



