lo Jackson, Deposit of tlie Loiver Bann Valley. 



the materials from which these were made being, in all 

 probability, obtained from the glacial drift which masks 

 the Lower Basalt of the neighbourhood. The majority of 

 those in the Darbishire collection are of clay-slate, a 

 material which appears better adapted, probably, than 

 any other for the easy manufacture of certain implements, 

 many of the specimens having been merely ground to a 

 cutting edge. 



The implements of this section might be conveniently 

 grouped under two heads — celts and chisels. 



Celts. — A small proportion only of the clay-slate 

 series have the typical shape of a celt. In Mr. Bell's 

 collection are several examples varying from 4 to 6 inches 

 in length and from i^, to 2\ inches in width, all of which 

 have been roughly ground and polished. They mostly 

 possess a semi-circular cutting edge, but one specimen, 

 5^ inches long, has a straight cutting edge bevelled on 

 each side. In my own collection is a very good specimen 

 obtained by Mr. Bell, 2 feet from the surface in the 

 deposit at Culbane. It measures j\ inches long, 3 inches 

 wide (except at the butt which is only i inch), and 

 1} inches thick ; it weighs 2lbs. It has been roughly 

 ground all over, but portions of the original surface are 

 visible in hollow places. The cutting edge shows signs 

 of hard usage, being much broken. {Plate II J., Fig. 11.) 



Celts of basalt and other rocks are, on the whole, 

 more numerous than those of clay-slate. Owing, pre- 

 sumably, to the greater hardness of such rocks they 

 would be found more serviceable for the manufacture of 

 celts. 



The majority in the Darbishire and Bell collections 

 have been wholly or partially polished, but some have 

 been roughly chipped to shape only. They are all of 

 much the same general shape, i.e.., the middle of the 



