1880.] Headon Hill and Colwell Bay, Isle of Wight. 63 



harmony with the stratigraphical. They arrive therefore at the 

 conclusion — the one universally accepted hitherto — that there is 

 only one marine series in this section, viz. the Middle Headon of 

 E. Forbes enclosed between the freshwater Lower and Upper Hea- 

 don, while the Brockenhurst bed does not occur anywhere in the 

 West of the island. 



White Cliff Bay and the New Forest. Professor Judd's reading 

 of the White Cliff Bay section (at the East end of the island) is 

 next criticised. It is pointed out that to rename the whole of 

 what has been hitherto known as Middle Headon, and call it 

 " Brockenhurst series," is quite contrary to the evidence of fossil 

 distribution. 



The Brockenhurst bed has been recognised by the Rev. 0. 

 Fisher and other writers so long ago as 1864, as existent in the 

 lowest two feet of the Middle Headon in the Vertical section of 

 White Cliff Bay, published by the Geological Survey. This bed is 

 extraordinarily rich in fossils like its German congener, while many 

 of them are peculiar to it. In a few days work, the authors collected 

 70 species from this one bed, all of them identical with those of 

 the well-known bed in the railway cutting near Brockenhurst; 

 many of these have been found at no other horizon, and do not pass 

 up into the Venus-bed. The Survey have been perfectly correct 

 in the position assigned to the latter bed at White Cliff Bay ; it 

 will be observed that it forms the upper part of the Middle Hea- 

 don there, and lies above the bed in which the Brockenhurst 

 fauna was afterwards recognized, being separated from it by yellow 

 sands, &c. These lower zones are not developed at the West end 

 of the island, the Middle Headon at Totland Bay being less 

 complete there. The " Brockenhurst zone " is restricted here to 

 the lower 2 feet of the Middle Headon, and it lies immediately on 

 the eroded surface of the Lower Headon. The authors propose 

 to designate as " Roydon Zone " the greenish gray and yellow 

 sands which intervene between it and the Venus-bed. 



In the New Forest section it is shown that Prof. Judd has 

 reversed the order of the beds by placing the Brockenhurst series 

 above the marine Middle Headon : this is plainly at variance 

 with obvious facts both at Brockenhurst and White Cliff Bay. 

 The exposure of this misapprehension as to the position of the 

 Brockenhurst bed in the series carries with it a refutation of his 

 theory as to the existence of this bed high up in Headon Hill. 

 It is not only nut in existence there, but the theoretical position 

 assigned to it in the Hill would be false. 



Affinities of Brockenhurst fauna. Prof. Judd's statement is 

 next examined, whether while "nearly one-third of the Hordwell 

 and Headon Hill marine shells are Barton forms, not more than 



