Manchester Memoirs, Vol. liii. (1909), No. 10. 



X. On the Diatomaceous Deposit of the Lower Bann 

 Valley, Co.'s Antrim and Derry, and Prehistoric 

 Implements found therein. 



By J. Wilfrid Jackson, F.G.S., 



Manchester Museum. 



(Communicated by Dr. IV. E. Hoyle, F.R.S.E.) 



'(deceived and read Jamiary 26th, igog.) 



CONTENTS : 



I. Introduction. 

 II. Description of the Diatomaceous Deposit. 



III. Description of the Prehistoric Implements. 



a. Flint Implements. 



h. Clay-slate and other Implements. 



c. Grindstones and Whetstones. 



d. Inscribed Whetstone. 



e. Grain-rubber, 



IV. Conclusion. 

 V. Bibliography. 



I. Introduction. 



For several years past the late Mr. R. D. Darbishire 

 has been particularly interested in the extensive diato- 

 maceous deposit along the valley of the lower Bann, and 

 in the prehistoric implements found so abundantly therein, 



April 2nd, igOQ. 



