46 Heports and Proceedings — Geological Society of London. 



section at the N.E. end of Headon Hill was described in detail, and 

 Prof. Judd's interpretation of this part of the section analyzed. 

 Prof. Judd places the marine Middle Headon at this point at the level 

 of the sea, maintaining that 250 feet of bedSj(the altitude of the 

 Bembridge limestone-quarry) intervene between the Bembridge lime- 

 stone and the sea-level. The authors maintained that the top of the 

 marine series is about 105 feet above the sea-level, that thickness 

 of beds intercalated above the Middle Headon having no existence 

 in tact, also that the Brockenhurst bed does not exist below the 

 Bembridge quarry, where it is supposed to be (concealed by gravel) 

 by Prof. Judd, and stated that there is no gravel at that spot 

 to conceal anything, and that the beds which do exist there are the 

 freshwater Osborne and Upper Headon beds as described by B. 

 Forbes. They then adduced fossil evidence confirmatory of the 

 stratigraphical ; thus out of 57 species collected this summer at 

 Colwell Bay, they found 53 at Headon Hill. (2) The sections at 

 Whitecliff Bay and the New Forest (Brockenhurst) were next 

 described. At Whitecliff Bay the 90 feet of beds which constitute the 

 Middle Headon of the Survey section have been renamed " Brocken- 

 burst seines " by Prof. Judd ; the authors maintained that the Brock- 

 enhurst bed, identical as to its fossils and position with that of the 

 Whitley Eidge cutting, is represented by the lower 2 feet only, imme- 

 diately above the freshwater Lower Headon. The Middle Headon at 

 Whitecliff Bay contains lower zones than any developed in the Middle 

 Headon of Headon Hill, for the Brockenhurst bed is entirely absent 

 from the west of the island. The authors maintained that Prof. 

 Judd has assigned a false position to this bed in his vertical section 

 of New-Forest beds, and that instead of being higher than the 

 Venus-bed horizon, it is plainly below it, since at Whitley Eidge it 

 lies on the Lower Headon. being succeeded by the Yenus-bed and then 

 by the Upper Headon. The palgeontological evidence was then dis- 

 cussed, and it was objected to Prof. Judd's lists that he has mixed up 

 the Colwell Bay and Brockenhurst fossils in one list, thei'eby begging 

 the question. In opposition to his statistics the authors maintained 

 that the Brockenhurst bed has about 48 per cent, of species which 

 pass up from the Barton beds, while the Venus-bed series of either 

 Colwell Bay or Headon Hill have only 29 per cent., suggestive of the 

 lower position of the former. 



Further examination of the lists of fossils prepared from an ex- 

 amination of the Edwards collection shows that the Colwell-Bay 

 and Headon-Hill marine beds have thirteen times more species 

 common to themselves alone than either of them have in common 

 with the Brockenhurst bed. The pal aeon tological evidence is there- 

 fore in accord with the stratigraphical ; they both occupy a higher 

 zone than the Brockenhurst bed, which, when developed, occupies 

 the base of the Middle Headon. The authors therefore reject Prof. 

 Judd's term Brockenhurst series, and revert to the classification and 

 nomenclature of the Geological Survey. 



