High and Low-level Shelly Drifts around Dublin and Bray. 151 



amount of granitic gravel and detritus among the other 

 material. 



Further on we examined the site of an old gravel-pit, for- 

 merly a mound or mammelon, but now levelled and grass- 

 grown. We had no time to examine the other numerous pits 

 scattered about the mountain and mentioned in Mr. Close's, 

 paper, but I saw sufficient to enable me to understand the 

 deposit in the light of the other high-level shelly gravels I 

 have seen and studied. 



Those interested in glacial phenomena should not omit to 

 visit Loughs Bray. At Curtelstown in Glencree, on the road to 

 these interesting corries, is a gravel-pit west of the Roman 

 Catholic Church, in which the gravel is mostly granitic detritus 

 mixed with some limestone pebbles, and containing man} 7 large 

 granite boulders. Notwithstanding the unlikely-looking 

 aspect of this material, a few minutes search resulted in the 

 discover} 7 of a fragment of a bivalve. The level is about 770 

 feet above the sea. Lower Lough Bray is about 1,225 f eet 

 above sea level, and Upper Lough Bray 1,480, according 

 to my aneroid observations. The striking feature of these 

 corries or cwms is that they are all in granite, and the moraines 

 that enclose their lower margins, considering the small area 

 from which the material can have come, are remarkably large. 

 The moraine of the upper lough rises 80 feet above the surface 

 of the water, and is very broad at the base, in fact shades off 

 into the valley below in great parallel undulations. One block 

 perched on the summit I estimated to be 25 feet high. The 

 upper part of the inner slope of the moraine was at an angle 

 of 35 degrees. The great bulk of material in these moraines 

 must have taken a great length of time to accumulate, and 

 evinces a long life of the small glacier that made them. 



We have now nearly come to the end of the descriptive part 

 of this paper, but must pause to say something of the Green- 

 hills esker. The question of the origin of eskers I do not 

 propose to discuss here. It is a subject to be considered apart 

 from the general glacial drift, and demands much more careful 

 consideration than it has yet received. Our exploration of 

 the Greenhills esker was confined to one day. We began at 

 the Balrothery end. I am simply recording facts, and refrain 

 from drawing any inferences from them. A very careful search 

 in the gravel-pit at the Balrothery end of the esker, the first we 

 came to, rewarded my son Aleyn with the discover} 7 of a small 



