Volume 97 



Young, Keith 



1951 Foramlnifera and stratigraphy of the 

 Frontier formation (Upper Cretaceous), 

 southern Montana. 1 



1952 Zonation of Upper Cretaceous Austin chalk 

 and Burditt marl, Williamson County, Texas* 2 





 1957 Upper Albian (Cretaceous) Ammonoidea from 



Texas. 3 



1957 Cretaceous ammonites from eastern Apache 

 County, Arizona. 4- 



1958 Graysonites. a Cretaceous ammonite in 

 Texas. 5 



1958 Ccnoraonian (Cretaceous) ammonites from 

 Trans-Pecos Texas. 6 



1959 Techniques of mollusc zonation in Texas 

 Cretaceous. 7 



1963 Upper Cretaceous ammonites from the Gulf 



Coast of the United States. 8 



