)7£ 0N T1I E BASALTIC COUNTRY I-V IRELAND. 



Tenth Stratum, (a). 



10th stratum. The stratum upon which the pillars of the preceding rest 

 is ochreous, red as minium, and about twenty feet thick ; 

 it is scarcely seen at Portmoon, a patch alone of its surface 

 being distinguishable under water at low tide; but imme- 

 diately to the northward it shows itself, and from its bright 

 colour makes a conspicuous figure across the face of the pre- 

 cipice in a course of more than a mile and a half; its last 

 KavinTalley. appearance to the westward is at Rovinvalley, the opposite 

 point of the bay from the Gianfs Causeway, from which we 

 have a good view of it. The final dip and immersion of this 

 tenth stratum, as well as its emersion, are lost for want of 

 perpendicularity. 

 ITth to lGth The six remaining strata are all similar in material, but 

 strata. differing much from each other in thickness ; they are all 



of that description called tabular basalt, sometimes show-, 

 ing a faint disposition to assume a columnar form at their 

 edges, and always separated from each other by ochreous 

 layers. 

 Not so distinct These six strata are not so perfectly distinct as those above 

 as the others. them, for sometimes we think we can count seven, and again 

 not more than five; nor does each of these preserve the 

 same thickness through their whole extent, for they are 

 deeper towards the northern point, where they culminate, 

 forming by themselves a perpendicular facade near two hun* 

 dred feet high, but they grow thinner as they recede from 

 this centre. 



The jets of black rock in the view of Purtmoon aTe the 

 emersions of these strata; their last appearance on the west 

 *ide is ut Rov'mvalley, where they strongly display the incli- 

 nation si iheir strata (the same with all the rest) to those 

 approaching from the westward ; their final immersion is lost 

 for want of perpendicularity. 



f shell now proceed to select from the great mas.;! of facts, 

 that are exhibited on the face of Bcngore promontory, and 

 eccur in the contiguous basaltic country, such ag seem ap- 

 plicable to geological questions, and likely to throw light on 

 ftucb sub';- 



Facts 



