12 Jackson, Deposit of tJie Loiver Bann Valley. 



specimens beinf]^ oiil}' \ inch in lliickness. Traces of 

 grinding arc visible in places on the sides of the lai'f^jer 

 specimens ; the smaller examples have, in many cases, 

 been ground all over. {Plate III..) 



A well-finished implement of cla\--slate of a triangular 

 shape was obtained 6 inches in the deposit near Culbane. 

 It measures 4;' inches long, 2 J, inches wide at the cutting 

 edge (which is semi-circular), and is onl)- 7"- inch in thick- 

 ness. This specimen is in m}' own collection. {Plate III., 

 ^^S- 7) I'l tl''C Darbishire collection is the fore-part of an 

 almost similar implement, which was also found at Cul- 

 bane, along with a rough triangular piece of cla\'-slate, 

 showing traces of grinding along one side, and at the 

 broad end on both faces, with the intention presumably of 

 forming a cutting edge. 



Under the head of chisels might also be included a 

 coarse cla)'-s!ate implement in the above collection, 10', 

 inches long, 2% inches wide, and \\ inches thick, weighing 

 2\ lbs. ; it was also found at Culbane. it has been roughl}- 

 chipped in [)laces, and one end ground down to a sharp 

 cutting edge. {Plate J I J., /v;'". 10.) Used as a wedge for 

 splitting timber it would prove most effective, and it 

 appears to me highly prcjbablc that many of the larger 

 chisel-like implements were used for that puri:)Ose. 



Tlie most remarkable implement of claj'-slatc, how- 

 ever, in the Darbishire collection, is one which was found 

 near Culbane in 1901, about 3 feet from the surface in the 

 diatom deposit overlaid by bog. It measures 17 inches 

 long, and is 4^ inches wide at one end, narrowing down 

 to 2^ inches at the other. It has been, in all probabilit}-, 

 several inches longer, as it appears to have been broken at 

 the narrow end. The thickness is only i inch throughout 

 and it weighs 61bs. 



Implements of this descri[)tion are exceedingly rare 



