6 Enoin Hinckley Barhour 



Fifty feet below the summit of the Crag, just to the east, is 

 an extensive blow-out of several acres in extent, swept bare by 

 the winds. Here one finds the tops of innumerable corkscrews 

 exposed. Here also the fossil corkscrews occur on every level, 

 as all the vertical exposures plainly show. A few rods north 

 of this, and from fifty to one hundred feet below it, in the bed 

 of a small canon, the water of an intermittent stream has ex- 

 posed the summits of many of these. Above them, in the 

 sides of the canon, occur great numbers of others at all levels. 



In every exposure, whether made by the force of the wind 

 or water, the same condition prevails, and fossil corkscrews 

 can be found at all levels in a vertical plane, and everywhere 

 in a horizontal plane. This seems to point to the fact that the 

 corkscrew, following the sedimentation, built upwards on dif- 

 ferent levels, as the sand-rock was deposited. 



One not familiar with the whole lay of the land in this re- 

 gion may assume that these were burrows built in the sides of 

 hills after they were eroded into their present shape. It would 

 be very diflicult under this assumption to account for the fact 

 that in the same plane for a distance of thirty -five to forty, or 

 more, feet, one finds these corkscrews superimposed, one di- 

 rectly above another, on all levels. This simply means a bur- 

 row forty to fifty or even one hundred feet deep, as shown at 

 Eagle Crag and in other vertical sections. The depth to which 

 animals burrow scarcely exceeds eight feet. Then if such an 

 impossible burrow could have existed, why not find it fossilized 

 throughout its entire length'^ Instead of fossil corkscrews 

 thirty or forty feet in height, we find them averaging about 

 six or eight. The fact that we find these fossils one below 

 another and still others below them, lying in the same ver- 

 tical plane, suggests that they must have built up along with 

 the sediment, or else they were bored downward from the sur- 

 face to different levels. 



It must be borne in mind in this connection that the work 

 of solidifying an incoherent sand into a fairly coherent rock re- 



