1106 General Notes. 
beds have now entirely disappeared, except as they are shown inside 
the caves. For instance, the Blue river of to-day cannot be con- 
nected with Wyandotte Cave. The entrance to the cave occurs on 
a side hill, a hundred feet above the present stream, yet 
inside the cave there is ample evidence, not only of the long-con- 
tinued action of small amounts of water, but, in places, the plainest 
signs of a considerable stream. So, too, in Little Wyandotte, a few 
rods away. Still, where that water entered the cave, and where it 
made its exit, are as yet unsolved problems. In the majority of 
caves which I have seen, the entrance seems a secondary formation 
produced by a falling in of the roof, or a wearing away of the hill 
itself. This last is clearly the case with Wyandotte Cave, which 
apparently once had a greater extent than it now has. In other 
cases the entrance is through a “sink-hole,” but it requires no little 
credulity to believe that that little funnel conducted the water 
which wore away such a cavern as “ Coon’s Cave” in this county 
(Monroe). 
believe that the majority of the caves about here had soquines 
_ essentially their present sizes and dimensions long before the 
adequate to account for the caves is evident to any one who bier 
this region. Recourse must be had to a time when the whole 
. 
_ GonIOPHOLIs IN THE JuRAssic oF CoLoRADO.—In my essay 
on the horizons of vertebrate fossils of Europe and North America, 
