Volume 16 



Cobban, W. A. 



I 

 1951 Scaphltoid cephalopoda of the Colorado Group. 1 



1953 Cenomanlan ammonite fauna from the Mosby Sandstone of 



central Montana. 2 



1958 Late Cretaceous fossil zones of the Powder River 



Basin, Wyoming and Montana. 3 



1962 Recent discoveries of the Cretaceous ammonite 



Haresiceras and their stratigraphio significance. 4 



1962 Late Cretaceous pemoscaphites range zone in the 



Western Interior region. 5 



1963 Occurrence of the Late Cretaceous ammonite floplito- 

 placenticeras in Wyoming. 6 



1964 The Late Cretaceous cephalopod flare siceras 



Reeside and ita possible origin* 7 



