MEYER — THREE DATS AT FARRINGDON. 



9 



3. Section at East Pit, Little Coxvvell. 



Surface soil 



Bed gravel — a dark ferru- 

 ginous deposit composed 

 principally of minute 

 subangular pebbles and^ 

 coarse sand, mixed with 

 terebratula, bryozoa, etc., 

 and few sponges. 



Junction of Red and Sponge- 

 gravels 



Sponge-gravel as in Wind- f 

 mill Pit. Sponges abun-«j 

 dant. 



4. Section at Windmill Pit, Little Coxwell. 

 Surface soil .... 



Kimmeridge clay ? 

 Coral-rag; . . . 



Sponge -gravel — a mixture 

 of shells, sponges, bryo- 

 zoa, etc., with but little 

 sand and few pebbles ; 

 the whole mass of a rich \ 

 cream or light ferrugi- 

 nous colour, regularly 

 stratified. 



Kimmeridge clay 

 Coral -rag . . 



Tjl 



These sections are intended to exhibit the Farringdon deposits in their relative position ; 

 the measurements in those portions of the sections noted as obscure by the dotted 

 line at the sides of the woodcuts must, however, be taken as merely approximate, as we 

 had no means of ascertaining their real thickness. 



section at Badbury Hill. Had he done so, he must have noticed the 

 fact that the same forms of Brachiopoda, with the addition of T. 

 oblonga, and the same species of Bryozoa occur there which are found 

 in the lled-gravel of East pit ; and noticing this, lie could hardly have 

 separated the " Sponge-gravels" so entirely from all the surrounding 

 deposits as he ultimately appears to have done. In one very impor- 

 tant particular Mr. Sharpe is surely wrong. In page 178 of the above- 

 mentioned memoir, he describes the ironstone deposits of Furze Hill, 

 and the Sponge-gravels, as forming " two deposits on the same level, 

 abutting against one another." Now my impression is that the lower 

 layers of the ironstone of Furze Hill, where in position, are decidedly 

 above the level even of the higher portion of the Sponge gravel ; and 

 I was at first somewhat at a loss to account for the fact, supposing 

 that the ash-coloured sands which we found to underlie the iron- 

 stone on Furze Hill, formed a portion of the Kimmeridge clay, and 

 not, as we afterwards found in the Badbury Hill section, a deposit 

 resting upon the Red-gravel. 



The accompanying sections, compiled, with Mr. Evans's assistance, 

 from notes taken on the spot, the parts margined by the double lines 

 being from exposed vertical sections, w-ill show more fully my idea 

 of the position of the various deposits; and it follows that if these 

 views as to the position of the " Sponge-gravel " are correct, the 



VOL. VIT. C 



