273 



Mr. W. Howchin, F.G.S. (Trans. Roy. Soc, June, 1900) has 

 noted the occurence of Tertiary beds at Point Turton and 

 Corney Point. The former first appear about half a mile east 

 of the jetty, and extend along the coast in a westerly direction 

 for a distance oi about 2J miles, forming an anticline rising 

 from sea level at either end to a height of 55 ft. at the apex. 

 The Miocene clays occupy a hollow in the eroded surface of the 

 Eocene, which consists of polyzoal limestone, and at the wes- 

 tern extremity of the anticline this limestone is being altered 

 into the travertine which overlies it. 



At Corney Point the outcrop of Eocene is very limited, ex- 

 tending along the coast for 30 ft. only, and having a thickness 

 of 6 ft. It directly overlies the metamorphic rocks. 



Glacial Clay (? Permo-Carboniferous). 



There can be little doubt that the glacial clay underlies prac- 

 tically the whole of the southern portion of Yorke Peninsula. 

 The principal known eXjposures were noted by Mr. W. Howchin 

 (Trans. Roy. Soc, June, 1900) at^West of Troubridge Hill, 

 Port Moorowie, Point Turton, Warooka, Yorketown, &c. In the 

 last case the clay comprises the whole of the lake country in 

 that neighborhood, an area of about sixty square miles. The 

 thickness of this and the nature of the underlying formations 

 have long been matters of speculation. 



We have noted the boulder clay in the south-west portion of 

 the Peninsula its thickness being shown by wells in the fol- 

 lowing localities, gneissic rocks in all cases underlying it: — 



1. On the coast at Point Souttar, Section 133, Parawurlie. 

 Thickness of clay, 6 ft. 



2. The Leaven's section, 140e, Parawurlie. Thicjkness of 

 clay, 15 ft. 



3. Gaeter's Section 163, Parawurlie. 



4. Hayes' Section 89, 90, Carribie. Thickness of clay, 9 ft. 



5. Section 102, Carribie, five miles south of Corney Point, 

 Thickness of clay, 12 ft. 6 in. 



6. Bob's Well, Section 8, Warrenben. Tliickness of clay, 

 16 ft. 



In all the above sections Pleistocene sands or limestones over- 

 lie tlie glacial clay. A bore 305.5 ft. in depth, sunk about one 

 mile east of Yorketown failed to penetrate the clay, which 

 evidently rapidly diminishes in thickness in a westerly direc- 

 tion. As shown by the well sections, it will be seen that these 

 wells lie on a line about four miles from the coast extending 

 from Point Souttar to a point about ten miles north of Cape 



