48 GEOLOGY OF ARRAN. 



length. Shells from the later deposits, the upper portions of 

 these beds, and from the surface of the marine terrace and 

 caves of the old sea cliff, have been found in a few places. 

 These all belong to species now inhabiting our seas; they 

 indicate that our climate had changed its sub-arctic character, 

 and become similar to that which now prevails. 



