558 ISLE OF MAN. GEOLOGY. LIMESTONE. 



careous deposit under both its present forms, even in 

 those cases where the actual gradation between the beds 

 and the shapeless rock cannot be traced. 



The next, and by much the most decided examples of 

 the absence of organic remains in the unstratified rock, 

 are to be seen in the neighbourhood of the black strata 

 at Pool vash. Both kinds of limestone are here found 

 together, the irregular being predominant; but they are 

 so situated that it is impossible to trace any connexion 

 between them beyond that of juxtaposition ; a circum- 

 stance which is probably to be attributed to the form 

 of the shore, which is flat, and to the imperfect manner 

 in which the beds are exposed. Had no other portions 

 than these been visible, the nature of the important con- 

 nexion between the two, might still have remained un- 

 known. It must be remarked that although the irregular 

 rock possesses here no marks whatever of stratification, 

 it cannot be called crystalline, except in a few points. 

 A perfect idea of it may be given to those who have 

 visited Devonshire, by saying that it resembles the lime- 

 stone near Stonehouse ; and perhaps an idea of the 

 crystalline variety more accurate than can be formed 

 from the preceding description, may also be conveyed 

 by comparing it to that which is seen near the same place 

 at the Devil's point. Other analogies will be apparent 

 hereafter. 



In the rock thus described, the organic remains abound, 

 as they do in that which is stratified, but their forms are 

 neither so entire nor so decided. It is not however cer- 

 tain that in this instance, as in the former, they have 

 themselves undergone any change, since their obscurity 

 may arise from the difficulty of procuring specimens of 

 the rock, as fair and as perfect as those which can be 

 obtained from the regular limestone. 



It is unnecessary to quote any more of the places where 

 similar appearances occur, as they offer no material dif- 



