BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



VOL. 8, PP. 305-314, PLS. 31-39 APRIL 14, 1897 



NATURE, STRUCTURE, AND PHYLOGENY OF DAEMONELIX 



BY ERWIN HINCKLEY BARBOUR 



(Read before the Society December 31. 1896) 



CONTENTS 



Page 



Introduction 305 



Mode of occurrence 306 



Daemonelix fibers 306 



Daemonelix cakes 307 



Daemonelix balls 308 



Daemonelix cigars or fingers 808 



Daemonelix irregular 309 



Daemonelix regular 310 



Daemonelix buds 311 



Superficial structure of Daemonelix 311 



Great tubes of Daemonelix 312 



Minute structure of the Daemonelix series 312 



List of papers .... 313 



Introduction. 



Since the first expedition in 1891 to the lofty Pine Ridge tablelands 

 of Sioux county, Nebraska, which led to the discovery of the Daemonelix 

 beds, annual expeditions to the same fields have become possible through 

 the liberal patronage of the Honorable Charles H. Morrill, of Lincoln. 

 To his generosity must be accredited the progress made in the study of 

 these beds which we are now enabled to report. 



Below Pine Ridge lie the well known Hat Creek badlands in the Mio- 

 cene formation. The topography here is characteristic of a clay region 

 subject to excessive erosion. It is typical badland. 



Overlying it and rising above it by nearly vertical walls, 1,000 to 1,200 

 feet in height, is the Pine Ridge tablelands. Here the sands of the Loup 

 Fork Tertiary, in which Daemonelix is found, are cut into bluffs, buttes, 

 blowouts, and precipitous canyons. 



XI/VI— Bull. Geol. Soc. Am., Vol. 8, 1896 (305) 



