EXPLANATION OF THE PLATES, 



PL AT E 1. 



Map of Sky. 



P L A T E 2. 



fig. 1. Shows the marble limestone of Kilbride incumbent on the syenite, and 



succeeded by alternations of shell limestone and schist. 

 Fig- 2. Shows the alternation of marble limestone and shell limestone atBorreresf. 

 Fig. 3. Shows beds of Lydian stone covered by trap : at Duntulm, 



PLATE 3. 



Fig. 1. Illustrates the variation of the compass on the summit of Glamich. 

 Fig. 2 & 3. Show how a mass of trap overspreading a series of flat strata might 



by the casual wearing away of parts, give the appearance of having been 



deposited at different eras. 



PLATE 4. 



Fig. 1. Shows the manner in which the sandstone of Strathaird is stratified. 

 Fig. 2. A compound trap vein at Strathaird. 



Fig. 3. Horizontal strata of sandstone intersected by trap veins : at Strathaird, 

 Fig. 4. A diagram shewing the supposed geological structure of Sky, 



PLATES 6, 6, 7. 



Crystals of Uranite from Cornwall. 



PLATE 8. 



Geological map of the N. E. of Ireland, 



PLATE 9. 



Shows the geological connexion between the W. of Scotland and the N, E. of 

 Ireland. 



