312 
THE MIDDLE LIAS OF NORTHAMPTONSHIRE. 
4. —Reddish sandy clay, passing downwards into a grey 
marl—the usual form of the Transition-bed. 
The upper part of the clay contained some 
badly-preserved fossils of a similar hind to 
those found in the marl ... ... ... 0 7 
5. —Bock-bed. 
I have already referred to the sections on the East and 
West Junction Railway as being about the best in the county 
for showing the sequence of beds from the lower part of the 
Upper Lias to nearly the base of the “ Marr/aritatus ” Zone of 
the Middle Lias. The several small cuttings extending from 
Byfield Railway Station to near Aston-le-Wall show succes¬ 
sively lower beds, so that in order to verify the section given 
below it would be necessary to walk some mile and a half 
along the line. 
Section on the East and West Junction Railway near to 
Byfield. Feet iu. 
1. Soll ... ... ... ... ... ... ... 
2. —Clay mixed with gravel, apparently unfossiliferous 3 0 
“ Communis ” Beds — 
3. —Upper Cephalopoda-Bed ; a flaggy limestone, 
whitish surface, violet interior, containing 
Ammonites bifrons, A. Holandrei, Belemnites, 
Pectens , Astarte, dc. ... ... ... ... 0 6 
4. —Clay-Marl, breaks into somewhat cubical blocks, 
little white concretions very numerous, con¬ 
taining Ammonites communis (abundant), A. 
bifrons, some synall “falcifer ” ammonites, Belem¬ 
nites, Astarte , Pentacrinite joints ... ... 3 0 
“ Serpentinus ” Beds — 
5. —Lower Cephalopoda-Bed ; a yellowish, hard, 
sandy limestone, dirty violet coloured interior, 
not flaggy, many small white concretions, 
containing Ammonites serpentinus, A. exaratus, 
A. Holandrei, A. communis, A. Levisoni, Belem¬ 
nites , Fucoid impressions ... ... ... 0 9 
G. —Light Coloured Marl, nearly white, not very 
homogeneous in composition, breaks into 
cubical masses, many white concretions, 
fossils very scarce ... ... ... ... 3 0 
“ Fish and Insect ” Beds — 
7.—Shale, scarcely distinguishable from bed above in 
the section, containing Flattened ammonites, 
Belemnites, Fish Scales ... ... ... .. 0 1 
