540 EKPORT— 1882. 



Professor Judd'a list of Brockenhurst fossils contains 62 species from Oolwell, 

 not occurring' at Brockenhurst; and 107 species from Brockenhurst, not found at 

 Oolwell ; while only '20 are recorded from both localities. This does not read like 

 a list of species from one formation. 



At Ileadon occur about 30 per cent., at Oolwell about 3'j, and at Brockenhurst 

 (omitting corals) about 62 per cent, of species from below the Ileadon series. 

 Professor Judd concluded that only |th of the Brockenliiu-st species occiu* in beds 

 below the Headon series. 



At,Whiteclitf a representative of the Venus-bed at Oolwell occurs, and below 

 it a representative of the Brockenhurst bed containing 69 marine species. Of 

 these 51 occur at Brockenhurst, and 53-6 per cent, of them in beds below the 

 ileadon series. These numbers are gathered from Messrs. Keeping and Tawney's 

 lists. The occurrence of abundance of CeritJiium concavum at Whitecliti' above 

 the marine beds has quite recently been observed by Mr. Keeping. 



The author concludes that there is only one middle marine group in the Headon 

 series, with two zones of fossils, the Brockenhurst zone being the lower. He offers, 

 as an explanation of the difficulty of correlating these beds with the continental, 

 if the presence be admitted of C. concavum above the Brockenhurst marine bed, 

 the suggestion that in the Hampshire area this species lived after as well as 

 before the deposition of these beds, though apparently it did not survive the depo- 

 sition on the Continent of the equivalent series of the Lower Tongrian. 



He supports Professor Judd in obliterating the group called the Osborne series, 

 chiefly on the ground of the dilKculty of tinding any natural line between it and 

 the Upper Headon, but would class these beds with the Headon series, not with 

 the Bem bridge. 



He also agrees with Professor Judd in obliterating the line of division made 

 by Professor Forbes at the Blacit Band at Ilampstead. The natural base of the 

 Hampstead series is tliat proposed by Professor Judd — viz. the Cerithium band at 

 the base of the marine beds. 



6. On the Outcrop of the Brochenhurst Bed, near LijndJiurgf. 

 Bij E."B. Tawney, M.A., F.G.8. 



Fossils characteristic of the rich bed which he had been lately working in tlie 

 railway cutting near Brockenhurst, were found by ]\Ir. H. Keeping at Outwalk 

 Hill, Lyndhurst, in 1858. The well at Emery Down, closely adjacent, also yielded 

 the same fossils in 1863. The excavations which the author had lately carried out 

 with the assistance of the Kev. J. Oompton of Minstead, on several sides of this 

 hill show the succession of the beds to be, at the base of the hill. Upper Bagshot 

 .sands, next in ascending order freshwater Lower Headon, marine Brockenhurst 

 bed, Valuta {/eutinata zone, followed by beds not explored, but concluding with 

 the freshwater Osborne marls at the top'of the hill. The succession is therefore the 

 .same as at Whiteclift" Bay. 



The thickness of beds between the freshwater Lower Headon and the Osbjrne 

 marls is about 100 feet. The Brockenhurst bed yielded a few of its characteristic 

 fossils, but near the outcrop these are weathered, or have entirely perished. It 

 seems hopeless to expect well-preserved fossils in pits of less than 20 feet deep. 



In conclusion tiie discovery of the freshwater Upper Ileadon beds in the 

 Roydon brickyard by Mr. II. Keeping, was announced. They are found to be at 

 least 7 feet thick, and contain layers rich in Potamo)nija plana. 



7. On Subsidence as the Efect of Acciimulaiion. J?^ Charles Ricketts, 



M.B., F.G.S. 



There is no fact in Physical Geology more frequently recorded than that, whilst 

 the deposition of sedimentary strata has been in progress, there has been simul- 



