726 
Proceedings of the Royal Irish Academy. 
merate must be of much later age tlian the Eennabeola rocks, as 
fi'agraents of the hitter are found in it.^ 
The discoveries of Lap worth and otliers, in connexion with shear- 
ing and upthrusting, are of the greatest importance, especially to a 
worker in a metamorphosed rock region ; but they must be used within 
their legitimate limits. If, however, as some seem inclined to do, an 
attempt is made to make them override all the more important ad- 
juncts of metamorphism, then it is attaching to them too great an 
importance. 
^ The late Mr. Hardman in his description of similar metamorphosed rocks, 
county Sligo, specially points out that they contain fragments of older rocks. 
