430 Correspondence. 



tion extends) when the rock is some little distance inland, as at 

 Morte Point, Devon, that they are to be found. 



It is possible that what I have stated may attract the notice of some 

 of the numerous excursionists at this season of the year, and, if so, 

 there would be no difficulty in verifying the few observations I have 

 ventured to send to your Magazine for publication. 



I am, sir, yours truly, 



William Gtibbens. 

 Chelmsford, Essex, 

 August 9th, 1867. 



THE BOULDER-CLAT OF THE THAMES VALLEY.^ 



To the Editor of the Geological Magazine. 



Dear Sir, — Any one wishing to see the Boulder-clay on the 

 southern side of the range of heights that form the northern 

 boundary of the Thames Valley, cannot do better than go by train 

 to Eomford, and walk to Havering-atte-Bower, three miles from 

 that place. The road is very pleasant and the view from Havering 

 beautiful. The Boulder-clay can be seen in a pit on the right hand 

 side of the drive leading from Havering to Bedfords, as well as in a 

 pit very near the letter D in "lodge" on the Ordnance Map. The 

 Boulder-clay is full of fragments of Chalk, more or less striated, of 

 quartz pebbles, and transported blocks and fossils. The fossils have 

 been caught up by the ice principally from the Oxfordian and Kim- 

 meridgian zones, and consist of Belemnites, Ostrea dilatata, and other 

 bivalves. In one fragment of shale I found Ammonites hiplex and 

 in a striated nodule from the Kimmeridgian there was a very well 

 preserved shell of that species. The great interest of this deposit is 

 its position to the south of the northern bomidary of the Thames 

 Valley proper. — Yours truly, 



W. BoYB Dawkins. 

 TJpMiNSTER, Romford. 

 June 22nd, 1 867. 



A Dynamical Theory of the Figure oe the Earth, proving the 

 Poles to be elongated.^ By F. C. Bakewell. 



It is the author's object to prove that the general figure of the 

 earth is that of a lemon, rather than of an orange ; in short, 

 that our planet must be elongated at the poles. " The question," 

 he states, " is capable of being determined, without much stretch of 

 reasoning power, by all who possess a knowledge of the first prin- 

 ciples of mechanical science. The only thing especially required is 

 that its consideration should be freed as much as possible from the 

 mists of prejudice and the trammels of authority." 



1 This letter was unintentionally omitted from the August number of the Geolo- 

 gical Magazine. — Edit. 



i Svo. London, 1867, pp. 26. (Weale). 



