246 LOWER OOLITIC BOCKS OF ENGLAND : 
FT. IN. 
Great Oolite - False-bedded oolite (= Taynton Stone) about 30 
"Yellowish marl (a few inches) passing into 
brown and blue shaly beds, with concre- 
tionary layers of micaceous and sandy 
limestone irregular and im persistent, and 
associated with buff and grey sands. These 
beds are very changeable in character. 
Stonesfield The concretionary beds exhibit "pot-lid" 
Slate and ^ features, they are slightly oolitic in struc- 
Fuller's Earth ture, and pass into slaty beds (Stonesfield 
Series. Slate) in the cutting N. W. of Salperton - 10 
Bluish-marly shales with micaceous gritty 
layers, slaty at base - - - 9 
Shaly beds - - - - 2 
Blue, obscurely oolitic and shelly limestone 4 
Bluish-grey marly shales, with bands of 
hard pale marl and impure fuller's earth, 
shown to depth of - - - - - 10 
The total thickness of the Fullonian Beds is from 25 to 30 
feet, and this was shown in the second cutting east of Notgrove 
Station. Here the mass of the formation consists of grey clay 
with "r^jje," and yields Ostrea acuminata. Towards the upper 
part there was a layer of fissile calcareous sandstone, exhibiting 
sun-cracks and trails of animals. The clay rested on a thin band 
of earthy iron-stained limestone, below which was the coarse 
oolite of the Clypeus Grit. 
Further eastward, in a cutting south-east of Roundhill Farm, 
a complete section of the Fullonian Beds is again shown, and 
there the Clypeus Grit is separated from the " Fuller's Earth " by 
about 8 feet of brown obscurely oolitic and rather sandy limestone, 
yielding Ostrea acuminata, Homomya, and Trigonia. The clays 
here are about 25 feet thick, and contain thin bands of fissile 
brown sandy and shelly limestone and white marl. It has been 
suggested that the beds of sandy limestone that overlie the 
Clypeus Grit, may correspond in age with the Chipping Norton 
Limestone. (See p. 133.) 
On the Geological Survey Map the Fuller's Earth has not 
been traced further than Little Barrington to the west of Bur- 
ford, in which neighbourhood it was considered to thin out by 
Lonsdale.* (See p. 510.) 
Near Chipping Norton there has been much difficulty in corre- 
lating the fieds. The observations of Mr. Hudleston, Mr. T. 
Beesley, and Mr. E. A. Walford, have it is true, smoothed the 
path for all subsequent inquirers, while the cuttings on the 
Chipping Norton and Banbury railway have afforded a capital 
view of the bed;?. Speaking with a little more confidence than 
they have done, I recognize the following strata : 
n .4- r\ lu f White Limestones, &c. 
Great Oolite I Stonesfield slate Series . 
I Fullonian Beds. (See p. 331.) 
Chipping Norton Limestone. 
* Proc. Geol. Soc., vol. i. p. 414. 
