Wright — Minor Periodicity in Glacial Retreat. 



io;j 



The tiny glacier tliat foriued in the hollow S.-E. of Tomies Mountain left 

 three or fonr moraines, one of which splits into three at one entl, thus 

 betraying its composite nature. 



The De\irs Piuicli Bowl has only one moraine ; the Horse's Glen also 

 only one ; but in the latter case the stages of final retreat may be marked 

 by the three lake basins. It is difficult to say why some of the local 

 glaciers show a periodicity in their retreat, while others do not. Possibly 

 considerations of altitude and aspect may have something to say to it. 



Fig. 4. — Map of Cairantuoliill and tlie western part of M'Gillicuddy's Kueks, sliowing tlie jieiiodic 

 moraines of the Conie glaciers. A. Lateral moraines of the Caragh-Glanciitlaun 

 Glacier. B. Cooiiiloiighra Glacier, confluent at its nia.xinium with the Caragh- 

 Glanciitlaun Glacier. C. Gaddagh Ghicier, foinied hy the confluence of three coirie 

 glaiiers. 



Possibility of a Lont/-pei'iod Climatic Oscillation, 



It is a rather remarkable thing that in the history of the retreat of every 

 one of the ice-tongues described above there came a time when no more 

 moraines were deposited even periodically. The area subsequently abandoned 

 is in most cases now occupied by a lake, e.f/., Lough Caragh, Lough Leane, 

 and Lough Guitane, or is merely a central basin, as in the case of the Dunloe 

 and Flesk glaciers. In either instances the relatively sudden cessation of 

 m raine formation is very marked, and would seem to indicate some fluctua- 

 tion in climatic conditions. An arguinent that at first sight would seem to 



