THE MIDDLE LIAS OF NORTHAMPTONSHIRE. 
21 
3. —Fish-Bed. A semi-nodular limestone, whitish, 
containing Kuomphalus minutus and many 
Fish fragments, Wood, dc. ... ... ... 0 3 
Middle Lias. 
4. —Bed Sandy Clay, not persistent. One large speci¬ 
men of Fleurotomaria araneosa found, but no 
other fossils ... ... ... ... ... 0 2J 
5. — Transition-Bed and Bock-Bed. A rather soft 
stone, having the same reddish mottled 
appearance so characteristic of the rock-bed 
on the Dorsetshire coast. The upper part is 
very full of G aster opods and small specimens of 
Hhynchonella tetrahedrci, and also contains 
Ammonites acutus, Falcifer ammonites, Belem- 
nites, dc., and a large number of small pebbles, 
and so is probably the representative of the 
Transition-bed, although it cannot be separated 
from the bed below. Ammonites communis is 
met with on the Bock-bed several inches below 
the surface ... ... ... ... ... 0 10 
This section is in several respects peculiar. In some 
places, and within a few feet of that where the above section 
was taken, we find the Bock-bed, Transition-bed, Fisli-bed 
or Ceplialopoda-bed (and perhaps in some cases both), forming 
only one block of stone, just as the Bock-bed, Pleurotomaria- 
bed, and Ceplialopoda-bed may be found combined in the 
coast sections west of Bridport. At a depth of about ten 
inches from the top the Bock-bed becomes suddenly slialy, 
bluer, and more like clay further down still, and totally 
unlike the Bock-bed as usually found. In one or two places 
there seemed to be an indifferent kind of separation between 
the hard rock and the shale. 
I certainly feel doubtful whether this is a part of the 
Bock-bed; or, indeed, a part of the “ IS'pinatus” Zone. 
It only yielded a few aviculas itself, but just at the junction 
with the undoubted Bock-bed Protocardium truncatum was 
met with, and this is exceedingly rare in the Bock-bed of 
the district. The beds above and below those given in the 
section were too much obscured to admit of easy examination. 
A little further along the line towards Bugby, and perhaps 
less than a mile away, there is a short tunnel through a 
Middle Lias Hill, and on each side of the tunnel several of 
the hard beds can be fairly well examined. A section is 
given below. 
