42 



Beneath the glauconitic limestone at Blanche Point, Aldinga 

 Bay, there is an unfossilit'erous iron-shot sand of unknown 

 thickness, but which to the north of Blanche Point gradually 

 rises in the section until it attains a level above that of the 

 Upper Aldinga Series, and is seen reposing, at a considerable 

 inclination, against the old slate rocks. It is doubtlessly 

 coeval with lignitiferous clay and sands in the Adelaide Basin. 



Section of the Strata Penetrated by Borehole, Kent 

 Town "Waterworks Yard. Level of Surface — 138.83 

 feet above Low Water Mark. 



Thickness 

 No. Description of Strata. in Feet. 



1. Soil, &e. ... ... ... ... ... 2 



Pliocene Drift. 



2. Eed clayey loam ... ... ... ... 28 



S. Fine waterworn gravel ... ... ... 8 



4. Grey pipe-clay, intermixed with sand ... ... 2 



5. Subangular gravel, to one-fourth inch gauge ... 5 



6. Grrey pipe-clay, intermixed with sand ... ... 4 



7. Sharp sand and small gravel ... ... ... 2 



8. Grrey pipe-clay intermixed with sand ... ... 1 



9. Pine yellow sand, somewhat clayey ... ... 3 



10. Grey pipe-clay, intermixed with sand ... ... 1 



11. Sharp sand ... ... ... ... ... 3 



12. Very sharp white quartz sand, of large dimensions, 



intermixed with subangular quartzite gravel to 

 li inch gauge. Water ... ... ... 10 



Miocene (Marine). 



13. Greenish-grey clayey sand and sandy clay '... 11 



14. Grey and reddish mottled clay ... ... ... 14 



15. Pine clayey sand ... ... ... ... 3 



16. Black clayey sand (fossiliferous) ... ... 25 



17. Lighter-coloured and more sandy than Xo. 16, with 



thin bands of sharp white quartz sand, which are 



slightly inclined to the horizontal ... ... 5 



18. Light blue calcareous clay, graduating into ... 4 



19. Blue argillaceous limestone (fossiliferous) ... 16 



20. Black, clayey, calcareous sand ... ... ... 3 



21. Black, argillaceous limestone with glauconitic grains. 



Very fossiliferous ... ... ... ... 5 



22. Grey shelly marls, with glauconite, varying to 



compact limestone ... ... ... ... 30 



23. Sandy and shelly marls ... ... ... 10 



24. Brown and green clayey sands. Very fossiliferous 23 



