PECULIAR DEVONIAN DEPOSITAN JELINOTS 487 
it the teeth of fishes which inhabited the sea thereabout. It is 
perhaps possible that the opening which has in recent time been 
uncovered at Elmhurst, was during this late Devonian time large 
enough for the entrance of some of these fishes, and that they 
sought this opening for shelter, much as fishes at the present time 
enter similar openings. 
The manner of communication between this opening and the 
surface is not clearly shown in-the field, but arenaceous material 
FIG. 3. 
with fragments of fish teeth is seen clinging to the quarry face 
to the left of and above the opening. This material may be 
rather indistinctly seen in Fig. 1, being represented by the dark 
blotches upon the lighter colored rock in the position indicated. 
This rock face is one side of a joint whose opposite side has been 
removed, through which there may have been communication 
between the buried opening and the sea bottom above. The 
