i6o, . The Irish Naturalist. 



epidote-garnet rock, which may hence be regarded as a true 

 eclogite. The epidote and garnet appear to have crystallised 

 siniultaneousl}^ and are intergrown in a kind of graphic 

 structure. 



The next cutting has at its eastern end banded hornblendic 

 schists. The rest of the cutting is in great part made up of 

 mica schist alternating in thin la3xrs with calcareous matter, 

 all being much crumpled. The calcareous matter maybe due 

 to the decomposition of lime-felspars, as Professor Cole has 

 suggested to me. There are some veins of calcite deposited 

 in the joints, the mineral being in pyramidal crystals. Galena 

 occurs in these veins. 



Along the lake, most of the cuttings are in hornblende 

 schist with quartzitic bands. In one place there are bands of 

 garnetiferous granulite ; sometimes the garnets are in well- 

 formed crystals up to one inch in diameter, and may be found 

 weathered out. In other places the garnets are in larger 

 crushed masses, or they may be streaked out into lenticles or 

 bands. 



Cutting West of Dkrrynken Bridge. 



The eastern end of this cutting is composed of hornblende- 

 schists w^ith quartzitic bands (granulite ?) Near the west end 

 is a large mass of little disturbed hornblende schist. Professor 

 Cole has made a microscopic examination of this schist, and 

 finds it to contain layers of calcite, with pink garnets and a 

 mineral that is probably a pale epidote. The schists are cut 

 by some veins of coarse granite, usually very quartzose, and 

 containing some calcite. In the granite are picked-up pieces 

 of the schist, whicli appear to have been partially fused. The 

 granite veins are often slightly displaced by faults. 



From this neighbourhood a capital example of folded strata 

 on a large scale may be seen on the side of I^etterbreckaun, 

 the most northerly of the Maam Turk Mountains, about 

 5^ miles distant. 



The cuttings between Derryneen and Recess are all in 

 quartzitic mica-schists, somewhat similar to those in the 

 cutting north of Shindilla. 



In Recess station-yard, a large vein of very coarse felspathic 

 granite may be seen in the schist ; it resembles the coarse 



