406 
LOWER OOLITIC ROCKS OF ENGLAND : 
day 
\ Ironstone rock. 
FT. IN. 
Lower Estoarine 1 C1 l 6 
Series. 
Northampton 
Sand. 
The beds below the sandy limestone, that no doubt represents the 
Collyweston Slate, were proved in a well. 
In Brigstock Park A similar sequence of beds was observed, 
the details varying to some extent in thickness.* 
At the northern end of Greddington Chase, and not far from 
the village of Stanion, the following section in the Great Oolite 
was noted by Prof. Judd : 
Glacial Drift. 
Great Oolite 
Clay. 
Great Oolite 
Limestone. 
Soil .... 
f Boulder Clay, containing boulders of 
j quartzite, Coal-measure sandstone, a 
J few flints, but little or no chalk. 
| Near its base traces of a gravel 
J composed of Northampton Sand 
I detritus were seen 
Variegated (greenish, bluish, and pur- 
plish) clay, in some places quite 
denuded away 
Pale greenish-white marl, full of irre- 
gular, concretionary, hard, sub- 
crystalline, calcareous nodules, also 
of a pale greenish-white colour 
(weathering white ; comparable with 
bed at Ailsworth) 
Green and variegated clay, with carbon- 
aceous markings 
Grey, foetid, somewhat sandy, lime- 
stone - - 
Laminated, marly parting 
Extremely hard, sub -crystalline, drab 
limestone - - - 
Marly parting - 
Marly bed, abounding in "Beef" 
Yariegated, dark, carbonaceous clays, 
finely stratified 
Fine laminated marl, with " Beef" 
Hard, white, shelly limestone, with 
many shells and an oyster-bed at the 
bottom, with 0. sulrugulosa - 
Marly bed, crowded with 0. Sowerbyi - 
JDark carbonaceous clay 
' Beds of hard limestone, with few traces 
of marly partings. The limestone is 
sometimes compact and full of 
oysters, or made up of comminuted 
shells ; and it becomes in places 
very oolitic, thus simulating the 
characters of the Inferior Oolite. 
Near the bottom there are traces 
apparently of pebbles of compact 
oolite (like those seen at Benefield). 
This limestone contains lignite, Ostrea 
Sowerbyi, Ediinobrissus clunicularis, 
&c. (the bottom not seen) 
FT. 

IN. 
6 
6 
* Judd, Geol. Rutland, pp. 190, 191, 197. 
