ON THE SUELL-BEAEING DEPOSITS AT CLAVA, AND OTHER I'LACES. 491 

 Journal of Boebs put down at Clava — contimwd. 



Note. — The highest part of the shelly clay at the main pit is 503| ft. above sea- 

 level. The shelly clay at pit 160 yds. south-west of main pit is 512 ft. above sea- 

 level, and the top of the hard clay 233 yds. south-west is 523^ ft. 



Fig. 1. — Plan showing positions of Pits and Bores at Clava Shell-bed. 



In the course of the boring operations samples of the various materials 

 were preserved and forwarded to Mr. David Robertson for examination 

 for the purpose of comparing them with the materials from the ' main pit.* 

 He has prepared the following report as the result of his investigations : — 



