560 ISLE OF MAN. GEOLOGY. LIMESTONE. 



observed, or their probable meeting inferred. The geolo- 

 gical conclusions which may be drawn from these facts, 

 will be equally deducible from one or two selected 

 examples. 



This junction is displayed in great perfection near the 

 mouth of the Santon river, where the boundary of the 

 limestone, towards the east, is marked on the map. The 

 position of the schist is here very irregular, but the laminae 

 are placed at high angles, varying from forty-five degrees 

 to the perpendicular. 



Although here of the usual blue colour and ordinary 

 degree of hardness which it displays elsewhere in the 

 vicinity, it is red and decomposed at the immediate line 

 of junction ; and the same appearance may also be 

 observed in the limestone for a similar space ; while in 

 neither does it extend beyond a few feet. The appear- 

 ance exactly resembles that already described as occurring 

 at the junction of the red sandstone near Peel. 



The limestone is here seen under both its forms, the 

 stratified and the unstratified, but the former is modified 

 in a manner which requires further explanation. In one 

 part of the junction, the schist and the irregular limestone 

 are in immediate contact, the character of the latter cor- 

 responding so exactly with the general account already 

 given, as to require no further notice. But where the 

 stratified rock abuts against the schist, it is suddenly 

 diverted from the low position in which it is found at 

 a small distance ; being turned upwards in a curved form 

 till it acquires a position considerably erect.* At the 

 same time, there takes place- a gradual change in that 

 accurate parallelism and evenness of the beds which were 

 before predominant. They become rough, undulated, 

 unequal in thickness, and deficient in that apparently nice 

 adaptation to each other which they possess where in 

 their natural or stratified position. In the same circum- 



* Plate XX VI I. fig. 1. 



