GEOLOGICAL SOCIETY OF DUBLIN. 133 



perfectly observed, may last their day, but that day cannot be long 

 while the spirit of inquiry is alive among mankind, and they are awake 

 to the power and sanctity of philosophic truth. 



" The higher the authority from which an error is promulgated, the 

 greater is the danger to science. If I differ from a fellow-labourer, the 

 greatest respect I can pay him is to tell him, plainly and honestly, 

 where I differ from him, and it is no mark of respect to merge plain 

 truth in mealy-mouthed words of stupid and unmeaning courtesy." 



"With these views, though I undertook the task of writing this paper 

 with reluctance, I thought it a duty to put forward the views I enter- 

 tain on the subject of it ; to record the convictions resulting from an 

 amount of experience that falls to the lot of few ; and to try to get cor- 

 rected what I believe to be an error, by laying before this Society my 

 reasons for that belief. 



EXPLANATION OF PLATE V. 



Fig. 1. a, a strong conglomerate at Sybil Head, about 60 feet thick; 

 the base of the Carboniferous formation dipping N. W. 60° into the 

 Atlantic, and lying unconformably on the ends of the brownstone 

 strata from a to b. 



g, m y n, h, i, supposed the original surface of the land. 



m, n, 0, p, a fossiliferous band of rock. 



h, h, a supposed line of fault or slip. 



c, k, a greenstone protrusion at Clogher Head. 



b, k, the white part a fossiliferous band at Ferriter's Cove, sup- 

 posed to have slipped down from the position m, n, on the line h, 1c, 

 and to be the equivalent of c, p, o, d: a similar fossiliferous band at 

 Doonquin Old Church ; each band a part of the original m, p, o, n. 

 See pp. 15, 16. 



At d the lithograph is defective : the white between d and the line 

 n, o should be shown as grit and slate, the same as between d and e. 

 Fig. 2. A, B, represents the Old Red Sandstone conglomerate ; over it 

 is the Old Red Sandstone, shown as dotted; next the Limestone, 

 white; and lastly, the Coal Rocks, shaded with close horizontal 

 lines. 



a, Granite. 



b y Stratified quartz rock. 



c, Mica slate. 



d, Primary crystalline lime- 



stone. 



e, Greenstone. 



/, Amorphous quartz rock. 



g, Gray clay slate. 



h, Gray grit. 



i, Red clay slate. 



h, Green grit. 



I, Green chloritic slate. 



m, Rrownstone. 



This plate is' illustrative of a paper entitled " Researches among 

 the Paleozoic Rocks of Ireland," by Mr. Kelly, for which see " Natural 

 History Review," vol. iii., p. 115. 



