502 F. R. Coirper Reed — Geology of Waterforcl. 



liow masses of that rock, the smallest of which is about 370 yards 

 in diameter/ masses, of which one has been traced to a depth of 

 500 3/ards, could remain throughout in a practically uniform glassy 

 condition. 



P.S. — This paper was written before the publication of the 

 notice of the late Professor Lewis' work (p. 366). On a few 

 points, as will have been seen, I differ from its author, but need 

 only refer to the following. Two are inaccuracies : on p. 367, 

 line 6, for "original" read '-unpublished," and line 13 for "three" 

 read " two." There was no manuscript of Section III, unless a few 

 references conld be thus called. A third is an error (p. 368) : the 

 largest inclusion in plate i is said to consist of rather decomposed com- 

 pact serpentiuized olivines and pj'roxenes. This reads to me rather 

 like nonsense, and I do not make the statement. I assert the fragment 

 to be " a rather decomposed compact serpentinous rock." I now 

 believe it is identical with some of the fragments described above. 

 In regard to the " Hard Wack Floating Keef," which the writer 

 apprehends may be the "Kimberlite proper," and laments that "no 

 detailed examination" of this rock has been given, I need only 

 remark that the slices used by Professor Lewis all represented the 

 same species of rock, the difference among them being only varietal 

 (none had descriptive labels) ; also that I strongly suspect I have 

 examined a specimen of it, furnished to me by the late Professor 

 A. H. Green (under a different name), and believe it to be nothing 

 else than a more compact variety of the ordinary rock. I fail to 

 understand the reviewer's remark about local writers and the shale 

 on p. 368. So far as I remember. Professor Lewis nowhere asserts 

 that the shale fragments are fused at the edges. A fragment of 

 shale may be altered yet not fused. The perofskite I am disposed 

 to consider generally, if not always, a secondary mineral. 



IV. — Notes on the Geology of County Waterford. 



1. The Fauna of the Ordovician Beds near Tramore. 



Bj F. E. CowPER Eeed, M.A., F.G.S. 



Introductory. 



DURING an examination of the complicated series of Lower, 

 Palaeozoic rocks in County Waterford, with which I am still 

 engaged, I have had the opportunity of collecting largely from the 

 few fossiliferous beds in the neighbourhood of Tramore, and a study 

 of the fossils throws considerable light on the vexed question of 

 their age. It is not my intention in this paper to discuss the 

 relations of the igneous and sedimentary rocks, nor to attempt to 

 explain the structure of the district. The palreontological evidence 

 of the exact horizon of certain fossiliferous beds will here alone be 



1 The largest must be about 450 yards in diameter. Some of the necks in 

 Scotland are considerably larger than this. See Sir A. Geikie's " Ancient Volcanoes 

 of Great Britain," chs. sxv and xxxi. 



