THE MIDDLE LIAS OF NORTHAMPTONSHIRE. 
278 
“ Serpentinus ” Beds — 
8.—Lower Cephalopoda Bed ; a white limestone 
with reddish exterior, containing many 
Ammonites of the falcifer group) ... ... 0 6 
4.—Liglit-grey clay or shale with red streaks in it ... 0 10 
Fish and Insect Beds — 
5. —Grey shale ... ... ... ... ... If in. 
6. —Red sandy shale ... ... ... ... 2Jin. 
- 0 4 
7. —Fish-Bed, very soft, only a little hard piece in the 
middle, sometimes nodular, slialy, not per¬ 
sistent, containing fish scales, &c. ... ... 0 2 
8 . 
9 . 
10 .- 
0 7 
G 0 
Ti 'a ns it ion B eds. 
Red sandy clay, slialy at top 
Transition-Bed, not distinctly separable from x 
the bed below ... 
“ Spinatus ” Zone of Middle Lias. 
-Rock-Bed, a ha.rd ferruginous rock, much 
of it of a bluish green colour, fossils very 
abundant, Belemnites paxillosus, Rhynchonella 
tetrahedra, Terebratiila punctata , Waldheimia 
resupinata , Ostrea sportella, &c _ 
The beds 5 and G, and the upper part of 8, I believe to 
represent the paper shales of Gloucestershire, for fish remains 
seemed about as common in bed No. 5 as in the fish bed 
itself, though they were not abundant in either. In the 
rock-bed there are two or three layers composed almost 
entirely of Rhynchonella tetrahedra. These layers are called 
“Jacks" by the quarrymen in Rutland, and the term is now 
frequently used by geologists. 
About two hundred yards west of the section above 
described is another, which is about as follows :— 
Feet In. 
1. —Soil and rubbly stone—disturbed rock ... ... 2 9 
2. —Rock-bed, not very ferruginous, very rubbly, near 
the top two irregular bands of ossicles and broken 
shells. Most of the fossils casts. Pectens, Rhyn- 
chonella tetrahedra , Terebratiila punctata, &c. No 
“ Jacks.” .. ... ... ... ... ... 8 G 
3. —Red sand, which is either the base of the rock-bed 
or a sandy layer in it. The best specimens of 
Terebratiila and Rliynchonella were got from 
this... ... ... ... ... ... shown 1 0 
