F. R. Cowper Reed — Geology of Waterford. 503 



considered, with a view to establish a definite base-line which has 

 previously been wanting in descriptions of these rocks. The con- 

 fusing statement has frequently been made that a mixture of 

 Llandeilo and Bala fossils is found in these beds and elsewhere in 

 Ireland, and that the principles of classification followed in Great 

 Britain are not applicable. From my study of the literature on 

 the Lower Palfeozoic of this part of Ireland, and from my investi- 

 gations in the field and museums, I feel convinced that this startling 

 opinion is due partly to the erroneous identification of the fossils, 

 partly to confusing fossils from distinct horizons, partly to the 

 repetition by folds, etc., of the same beds, and partly from mis- 

 apprehension of the distribution or vertical range of some species. 

 I have given below a list of the literature containing references to 

 the fossiliferous and associated rocks of this district, but for the 

 above reasons we cannot unfortunately rely on the lists of fossils 

 which are said to occur in them, and I have consequently drawn 

 my conclusions only from specimens collected in the various 

 localities by myself or from those of identifiable horizons which 

 I have personally examined. 



1821. Thomas Weaver, "On the Geological Eelations of the East 



of Ireland " : Trans. Geol. 8oc., ser. i, vol. v, p. 117. 

 1821:. Eev. E. H. Eylaud, "The History, Topography, and 



Antiquities of the County and City of Waterford." 8vo. 



London (passim). 

 1833. J. Hodgson Holdsworth, " On the Geology of the District 



of the Knockmahon Mines " : Journ. Geol. Soc. Dublin, 



vol. i, p. 85. 

 1839. Sir E. Griffith, "On the Principle of Colouring adopted for 



the Geological Map of Ireland, etc." : Journ. Geol. Soc. 



Dublin, vol. ii, pt. 1, p. 78. 



1839. Major Austin, " A brief Notice of the Geology around the 



Shores of Waterford Haven " : Proc. Geol. Soc, vol. iii, 

 p. 154. 



1840. Th. Weaver, "On the Geological Eelations of the South of 



Ireland " : Trans. Geol. Soc, ser. ii, vol. v, p. 1. 



1841. T. Austin, "Observations relative to the Elevation of Land 



on the Shores of Waterford Haven, etc." : Proc Geol. Soc, 

 vol. iii, p. 360. 

 1841. J. Apjohn, Presidential Address : Journ. Geol. Soc. Dublin, 

 vol. ii, p. 132. 



1843. General J. E. Portlock, Geol. Eep. Londonderry, pp. 262, 



283, 292, etc. 



1844. Sir E. Griffith, " On certain Silurian Districts of Ireland " : 



Eep. Brit. Assoc. Trans., p. 46. 



1844. H. N. Nevins, " Some Eemarks on Three Localities of 

 Silurian Fossils lately discovered in Co. Waterford " : 

 Journ. Geol. Soc Dublin, vol. iii, p. 78. 



1844. " Localities of Silurian Fossils lately discovered in Water- 

 ford, Wexford, and Wicklow " ; Journ. Geol. Soc Dublin, 

 vol. iii, part 1, p. 57. 



