ON THE SHELL-BEARING DEPOSITS AT CLAVA, AND OTHER PLACES. 497 



Extent of Shelly Clay. — From the excavations and trial bores it 

 would appear that the shelly clay is continuous for a distance of 190 

 yards along the south-east bank of the Cassie Burn — viz., from bore 

 No. 7, situated 30 yards north-east of bore No. 1, to the small excavation 

 160 yards south-west of the 'main pit.' 



The Committee regret that, owing to the cost of these trial bores, 

 they were unable to determine the thickness of the blue shelly clay in each 

 bore. Had funds permitted they would have traced the extension of the 

 deposit in the area north of the Cassie Burn and other directions. 



Section at ' Main Pit 



By 



tabulating the results 



TO Solid Rock. 



(1) of the excavation at the ' main pit,*^ 

 (2) of bore No. 1, and (3) the section on the cliff above the ' main 

 pit,' the Committee are able to construct the follovring section, showing 

 the sequence of deposits at this locality : — 



1. Surface soil and sandy boulder clay 



2. Fine sand 



3. Shelly blue clay with stones in lower part 



4. Coarse gi-avel and sand .... 



5. ' Brown clay and stones ' . . . 



6. Solid rock, Old Bed grit .... 



Feet 

 43 

 20 

 16 

 15 

 21i 



The accompanying section, drawn to a scale of 48 feet to an inch^ 

 shows the above result in diagram form : — 



Fig. 2.— Section at ' Main Pit,' Clava, to Solid Eock. 



1893. 



K K 



