LOWER CHALK—YORKSHIRE. 
231 
Norfolk, that Avicula gryphceoides is a common fossil in them, 
as it is also in the Sponge Bed and in the lower beds of Chalk Marl 
in the counties above mentioned; lastly, that at the base of Bed 4 
there is a great increase in the quantity of shell fragments. From 
this evidence he concludes that Beds 1, 2, and 3 (with a combined 
thickness of 38 feet) are an expansion of the Sponge Bed, just as 
we saw reason to conclude that in Norfolk the Sponge Bed is a con¬ 
densation of some 25 feet of the Chalk Marl proved at Stoke Ferry ; 
he also thinks that the lower part of Bed 4 corresponds to and is 
an expansion of the Inoceramus Bed. 
With respect to the colour-bands, both Mr. Blake and Mr. Hill 
have pointed out that they are not restricted to definite strati- 
graphical horizons, but that even within short distances the red 
colour dies out of one and reappears in a different bed. Thus 
the red colour at the base of Bed 2 “ forms an undulating line 
which does not coincide with the plane of stratification.” Again, 
near Nanny Goat's House the whole of Bed 4 is grey, while there 
is 6 feet of pink chalk above the Grey Bed (in Mr. Hill’s Bed 5). 
A mile further east, where this bed comes down to the beach, 
there is no red colour in No. 5, but 8 feet of the chalk below the 
Grey Bed is coloured pink ; moreover, a little further east there 
is no colour at either horizon. 
^one of Offaster sphaerieus. 
The first good section in South Yorkshire is afforded by the 
cutting on the Hull, Barnsley, and West Biding Bailway. The 
following succession was taken by Mr. W. Hill on the south side of 
the line, about 400 yards west of Sugar Loaf Hill : — 
ft. 
Bather hard whitish chalk, weathering in platy pieces, in 
courses divided by seams of marl ----- 23 
Hard chalk, whitish above, greyish below, with a grey marl 
band at the base (fossils) - - - - - - If 
Hard whitish chalk, weathering into rough platy fragments, 
divided into courses by marly seams - (3 
Softer marly chalk, rather nodular, bedding indefinite, stained 
a bright pink - - - -.4 
Hard rough whitish chalk - 3 
Totternhoe Stone. — Hard grey nodular chalk, becoming platy 
below, with green-coated nodules at base - - 14 
38j 
Mr. Hill obtained many fossils from the Totternhoe Stone 
or “ Grey Bed,” and he remarks that “ large Ammonites are common 
as usual at or just above the horizon of the 4 Grey Bed,’ and I left 
one in the cutting 1 foot 8 inches in diameter.” 
The next good exposure of these beds is near Park Farm, Londes- 
borough. Of this Mr. Hill says “ I hardly think the chalk seen 
