SECTION AT KOKDWELL CLIFFS. 569 



have been evident that the marine bed occupying a lower level in the 

 undercliif could not have been in place. 



We may add that no beds have ever been seen at Hordwell higher 

 than the marine Middle-Headon bed. This agrees with the view 

 taken by the Rev. 0. Fisher, who says : — " It will be seen from the 

 above section [of the Hordwell beds, made in 1853] that the calca- 

 reous bands of Hordwell, belonging as they do to the first freshwater 

 series above the Barton, must be correlated with the Lower-lieadoii 

 Limestones, of which the How-Ledge Limestone is the top. They do 

 not represent the Great Upper-Headon Limestone. Any correlation 

 of the beds of Hordwell Cliff with those of Colwell Bay [north-east 

 of How Ledge] will therefore be misleading; the former being below 

 the horizon of the How-Ledge Limestone, and the latter above it." 

 It is at Warden Cliff and Totlands Bay that the correlatives of 

 the Hordwell Series must be sought for. Mr. Fisher adds : — " The 

 stratum on the mainland which corresponds with the Colwell-Bay 

 or Headon-Hill ' Venus-bed ' must be sought for at Hordwell above 

 the freshwater series ; and it occurs at a place called Rook Cliff, 

 about a mile to the east of Beacon Bunney in a low cliff. It is 

 usually buried under a talus of gravel " (Geol. Mag. Dec. 2, vol ix. 

 p. 139). Prof. Judd, however, remarks that Mr. Fisher identifies 

 the thin limestone band below the marine bed with the How-Ledge 

 Limestone of the Isle of Wight (Quart. Journ. Geol. Soc. vol. xxxviii. 

 p. 474). But it will be seen that we hold similar opinions with 

 Mr. Fisher. It is true that half a mile further east, near Weston- 

 Lane End, freshwater beds are seen; but they are easily recog- 

 nizable, from their fossils and peculiar lithological character, as the 

 Unio-hed, which, as is well known, belongs to the Lower Headon. 

 They are probably brought up by a slight undulation in the beds ; 

 there is no doubt at all as to their identification. 



We conceive Dr. Wright to be in error in stating that the L T pper 

 Freshwater formation exists at Hordwell, though he gives 20 feet 

 thickness for it. On examining his description we find his bed 

 JNo. (2) to be the Unio-hed, which belongs to the Lower Headon. 

 No such bed exists at any locality where the Upper Freshwater has 

 been examined. Dr. Wright's bed No. (1), from its great thickness, 

 we cannot identify ; but it may probably be the upper part of the 

 sands of the Z7mo-bed, which is nearly unfossiliferous at top. He has 

 moreover missed the Limn cea -limes tone, or else made no mention of it. 

 Searies Wood, in speaking of the remaining portion of cliff to the 

 eastward, says * : — " I consider [it], more from position than from its 

 organic contents, as the Upper Fresh-water. Indeed I am not ac- 

 quainted with any species peculiar to this stratum ; for I have found 

 all hitherto published as such in the Lower Freshwater at Hord- 

 well." He thus admits the fossil evidence to be opposed to his 

 conclusion respecting the position. 



Dr. Wright's first bed of the Lower Headon (Lower Freshwater) 

 No. 5, is our bed (28), identifiable by the Gyrogonites. Both Dr. 

 W right and Searies Wood f agree in considering the Lower Headon 

 * Loc. cit. p. 3. t Loc. cit. p. 5. 



2s 2 



