FOSSILS OF THE DENVER FIELD. 

 Table of invertebratt fossils in the Denver field — Continued. 



79 



SECTIOX II.— STRUCTURE. 



INTRODUCTION. 



The Denver field is separable, structurally as well as topographically, 

 into foothills and prairies, and these are still further divisible into areas that, 

 in their geologic development, are almost wholly independent. 



