1895.] In the Region of the new Fossil, Demoneliz. ee 
were outcrops of a thin stratum of siliceous limestone similar 
to what had been found on some of the hills north of Harrison. 
Here, however, the siliceous matter was in the form of moss 
agate and made up by far the larger part of the rock. 
In the upper courses of these cafions we found the “ cork- 
screws.” We certainly had not been deceived as to their size ; 
the largest that we had seen in the neighborhood of Har- 
rison were pigmies beside some that now presented themselves 
to view. Few of them were small. Stems and spirals nearly 
three feet in diameter were not uncommon, but they were not 
quite so regular and smooth as the smaller ones to which we 
had become accustomed during our three weeks digging. 
Many of them were found in which the great spiral seemed to 
end in a broad top, but in no instance did we see any evidence 
of the tree-like tops that we had been told were to be found 
here. The one specimen that was pointed out to us, illustrat- 
ing this feature, proved to be nothing more than an irregular 
mass of nodules that had been exposed by the wind and rain 
in the bank above a “ corkscrew.” Between the nodules and 
“corkscrew ” there was no connection whatever. These irreg- 
ular structures of a more or less calcareous nature are very 
common in the formation in which the corkscrews occur, and 
may no doubt be found throughout the whole Niobrara form- 
ation. They seem to be mentioned by Hayden and others, 
and it seems strange that the same observers never saw the 
“ corkscrew. 
At Agate Springs there were no wash-outs on the south side 
of the river so as to enable one to say definitely whether the 
“corkscrew ” area extends south of the river. But without 
doubt they may be found there. During the past year speci- 
mens have been found in Dakota, thus extending greatly the 
large area in which we found them in 1892. 
As in the beds near Harrison, fragments were common. 
‘One, which came near being left in the field, was turned over 
and disclosed to view, imbedded in its mass, the legs and sev- 
eral vertebree of an animal about the size of a large deer. 
The bones were clamped into the side of the stem just as a 
