596 Scientific Proceedings, Royal Dublin Society. 
could not have happened without disturbance. After comparing 
conclusions past and present, [am unable to see that unconfor- 
mity in any degree resembling the latter, has been established to 
exist in the Iveragh country. Unrepresented time may have 
passed between the deposition of any two beds of rock, an in- 
definite assertion impossible to fix more than theoretically to 
any horizon amongst parallel or transitional beds, in most 
eases. This reduces the position in favour of which it is em- 
ployed from the status of fact to that of conjecture, the proba- 
bility of which must be decided on its merits. 
As the whole of this interesting subject still engages the 
attention of very competent observers, we may hopefully look 
forward to its mysteries being solved, and the geological relations 
of the rocks in the south of Ireland to each other, and to those 
of south-western England being fully comprehended at last. 
