THE CRETACEOUS AND TERTIARY FORMATIONS OF 



WESTERN NORTH DAKOTA AND EASTERN 



MONTANA 



A. G. LEONARD 



State University of North Dakota 



CONTENTS 



Introduction 



Pierre Shale 

 Distribution 

 Characteristics 

 Fossils 



Yellowstone — Bowman County area 

 Dawson County area 

 Fox Hills Sandstone 

 Distribution 

 Cannon Ball River area 

 Contact with Lance formation 

 Little Beaver Creek area 

 Dawson County area 

 Variability of Fox Hills 

 Lance Formation 

 Distribution 

 South-central North Dakota area 



Section on Cannon Ball River 



Section on Heart River 



Bismarck section 



Divisions of the Lance formation 

 Little Missouri area 



Contact of Lance and Fox Hills 



Plants 



Oyster bed 



Dinosaurs 

 Yellowstone Valley area 



Glendive section 



Fossils 

 Missouri Valley area 



Section on Hell Creek 



Fossils 

 Age and relationship of Lance formation 



507 



