6 Erwin H. Barbour, 



Harrison, Nebraska. At Eagle Crag, but a mile and a half 

 north of Harrison, the conditions were most favorable, and 

 here our best specimens were obtained. 



I visited this spot for the first time June 30, 1891, in com- 

 pany with Mr. Charles E. Holmes (Yale, '84), securing at that 

 time one specimen (see Plate I.) and marking many others ; 

 intending to return and work these fields over at the end of 

 our expedition in the bad lands of Nebraska and South 

 Dakota. Failing in this, I returned May i, 1892, and in 

 spite of the storms and blizzards which prevailed, was enabled 

 to collect and ship within a week a ton of these extraordinary 

 fossils, though forced by the blizzards and drifting snow to 

 abandon some which we had quarried out, and were ready to 

 pack for shipment. 



The third or Morrill expedition, consisting of a party of 

 six, sent out in the interest of the State University, and at 

 the expense of the Hon. Charles H. Morrill, the author being 

 in charge, camped June 21st in these new fossil beds, opened 

 and made known the previous year, and devoted a fortnight 

 to their study. 



Later, these beds were explored along Pine Ridge — the 

 northern limit — to Squaw Caiion, a distance of some twenty 

 miles, and as far south as the Niobrara River, about twenty- 

 five miles ; thence along the Niobrara, the southern limit of 

 the beds. 



These lines include several hundred square miles of known 

 Daimonelix or Devil's corkscrew beds. While Pine Ridge is 

 plainly the northern limit, and the undetermined eastern and 

 western limits are roughly the eastern and western county 

 lines respectively, yet the Niobrara River, while apparently 

 the southern boundary, is not strictly such. 



Viewed as a whole this is an extensive field. Its fossils are 

 presented to view in the greatest numbers along the northern 

 and southern borders, where the erosion and transportation is 

 most extensive, and lost sight of in the grass-covered prairies 

 between, save where exposed in occasional draws, bluffs, and 

 blow-outs. 



306 



