Geological Society. 405 



Modbury presents many undulations, Mr. Austen suggests that the 

 slate beds of the south may be the equivalents of the limestone on 

 the north ; in which case the passage downwards into the mica slate 

 and gneiss of the Prawle Point may be the equivalents of No. 4, in a 

 metamorphic condition. 



6th. The limestones of Torbay, &c., which are said to constitute 

 the newest deposits of the series, not being covered by any formation 

 into which they pass. 



The carbonaceous rocks of central Devon are stated by Mr. Austen 

 to form no part of the above system, but to rest upon it uncon- 

 formably. 



May 8. An extract from a letter addressed to Mr. Murchison by 

 Mr. Miller of Cromartie, was read. 



The fish beds in the old red sandstone of the neighbourhood of 

 Cromartie, are very extensive. They are overlaid, where not denu- 

 dated, by a thick stratum of soft yellov sandstone ; and are under- 

 laid by a deposit consisting of red sandstone, containing in the middle 

 a chocolate-coloured conglomerate, similar to that of the Findhom. 

 The bold cliffs of the Moray Frith present fine sections of the old 

 red, including the fish beds. The letter is accompanied by illustra- 

 tive drawings exhibiting the succession, range, and dip of the strata. 

 Mr. Miller gives also an account of a series of faults in the Burn of 

 Ethie, one of which, he conceives, may be traced nearly north to the 

 town of Cromartie. 



A paper was read. On the London and Plastic Clay formations 

 of the Isle of Wight, by Mr. Bowerbank, F.G.S. 



The object of this communication is to show that there are no 

 zoological distinctions between the London and Plastic Clays. Mr. 

 Bowerbank first examined closely the strata of White Cliff Bay, and 

 found the ascending order of the beds to be as follows : — 

 Chalk. 



L Variegated clay, principally red, corresponding! ._ 

 with b and c in the Alum Bay section* , . . . / P 



2. Dark greenish grey sand, like that of the lowest 1 f,- 



part of d. Alum Bay j 



3. Red and yellow sands 27 — 



4. Dark greenish grey sand and clay, similar tol „_ 



d, Alum Bay J 



5. Red and yellow sands like those of Alum Bay 30 — 



6. Dark greenish gray sand and clay, in which "j 



were found Venericardia planicosta, Cerithia, > 30 — 



and other London clay fossils J 



7. Variegated sands 6 — 



8. Dark greenish gray sand and clay 186 — 



At different points in this interval the 

 author found small Nummulites, with Lon- 

 don clay species of Venus, Voluta, Ceri- 

 thia, &c., and in one place large Num- 

 mulites like those obtained at Bricklesome 



* See Mr, Webster's section in Sir Henry Englefield's Isle of Wight, 

 Geol. Trans., 1st series, vol. ii., PI. 11. 



