404 
LOWER OOLITIC . ROCKS OF ENGLAND: 
The beds are faulted in places, but the sequence can be traced as 
follows : 
Great Oolite 
Clay. 
about 
Great Oolite 
Limestone. 
Upper Estuarine 
Series. 
Lower Estuarine 
Series. 
Northampton 
Sand. 
Upper Lias. 
Brown clay - 
Black clay with ironstone- 
nodules 
. Grey clay - - -J 
"" Fissile earthy and marly beds, with 
Ostrea .... 
Hard flaggy, and shelly calcareous 
sandstone .... 
Fossil-bed : Marly and oolitic layer, 
full of Ostrea, Modiola, Myacitee, and 
Pholadomya .... 
Oolitic shelly and marly limestone 
Oolitic marly bed : Ostrea, Trigonia 
False-bedded shelly and marly oolite 
Fossil-bed : Brown earthy clay and 
impure limestone, with Modiola, 
Ostrea ... 
Pale earthy and occasionally shelly 
limestones, with earthy partings^: 
Ostrea, RJiyncTionella - 
Blue clay (full thickness not seen) 
- about 
Marl, with Ostrea and Rhynchonella - 
Flaggy and sandy limestone : Ostrea - 
Pale marly bed - - 10 to 
Clay, with Ostrea and crushed 
Rhynchonella - 6 to 
Shelly and earthy limestone and marl, 
with fossils as above - 1 6 to 
Clays with Ostrea Sowerbyi 
Calcareous sandstone, with Rhyncho- 
nella and Ostrea, resting on irregular 
surface of bed below 8 to 
C Grey and brown shelly sand, clayey 
in places and passing into white 
j sand - - - 2 to 
I Clay 
C Brown ironstone - - "1 
I Brown and green ironstone > about 
I Nodular bed - - J 
I Sandy clay with ironstone-nodules 
Blue micaceous clay. 
FT. IN. 
6 
1 3 
1 
1 2 
6 
1 7 
7 10 
1 6 
9 
9 
2 
1 
3 
8 
15 
8 
The junction of the Ironstone and Upper Lias Clay is rather 
irregular, and it appears that the base of the ironstone is nodular 
(or conglomeratic ?) where it rests in the hollows of the clay 
beneath. 
From the Great Oolite Limestone I obtained Gervillia crassi- 
costa, Modiola imbricata, Ostrea Sowerbyi, 0. subrugulosa, Perna 
rugosa, Trigonia elongata, and Thamnasfrcea. 
At Cinque-foil Lodge, south-east of Warkton, near Kettering, 
a trial-boring (made by Mr. T Hennell) was carried to a depth of 
77 feet in " Limestone Eock," and below that into brown clay to 
a further depth of 19 feet. The Limestone Rock probably 
includes not only Great Oolite, but the underlying Inferior Oolite 
Series, down to the top of the Upper Lias Clay. 
