VIII CONTENTS. 



CHAPTER V.— CRETACEOUS SYSTEM. By C. A. White. 



1. Earlier Cretaceous Page 285 



2. Nishnabotany Sandstone 289 



3. Woodbury Sandstones and Shales 291 



4. Iiioceramus Beds 293 



PAET THIED. 



COUNTY AND BEGIONAL GEOLOGY. 



CHAPTER I. -GEOLOGY OF SOUTHWESTERN IOWA. By C. A. 

 White. 



1. General Description Page 296 



2. The Missouri River Bottom 298 



3. Madison County 305 



4. Clarke County , 316 



5. Decatur County 318 



6. Ringgold County 328 



7. Union County 330 



8. Adair County 336 



9. Adams County 339 



10. Taylor County 344 



11. Page County 348 



12. Fremont County 353 



13. Montgomery County 362 



14. Mills County 367 



15. CassCounty 371 



16. Pottawattamie County 376 



