GREAT OOLITE: HOOK NORTON. 333 
growths of colonies of the organism.* A band with Thamnastrcea 
Lyelli was noted by Mr. Beesley, about the horizon of beds 15 
to 17, and he has collected many other fossils, including Cypri- 
cardia bathonica, Pecten annttlatus, Trigonia, &c.t 
The upper beds are of considerable interest. We may take 
bed 25 as the top of the Great Oolite. It is noteworthy as 
yielding Gervillia Waltoni somewhat abundantly, as well as an 
Astarte, identified as A. angulata by Mr. Hudleston, who refers to 
the bed as the " Angulata-bed" and compares it with a band in 
the section at Kirtlington.J This species occurs also at Ashford 
Bridge and Minchinhampton. Mr. Beesley has recorded a number 
of fossils from this Astartc-bed, including species of Cerithium, 
Natica, Nierinaa, Cardium, Corbula, Cyprina, Cypricardia, 
Macrodon hirsonensis, Pteroperna, &c. 
Fossil-beds here as elsewhere occur at varying horizons in the 
Great Oolite, and it appears impossible to mark any limits for the 
Upper and Lower Divisions of the formation, to compare with 
those noted in Gloucestershire. 
A section at the lime-kiln, Traitor's Ford, about 2 miles north- 
west of Hook Norton, showed the following section : 
FT. IN. 
"Rubble. 
Marly limestone, with casts of lamelli- 
branchs. 
Pale shelly oolite (the lower part yields 
the best lime, employed for white- 
washing, &c.) - 4 
Hard blue-hearted oolitic limestones - 3 
_Marly beds. 
The only fossils I obtained were Lima cardiiformis, and 
Echinobrissus Griesbachi ? 
The beds may be about the horizon of those numbered 17 and 18 in the 
railway-cuttings (p. 330) ; and higher beds (=18 to 21) were shown east 
of the lane, where clayey beds of considerable thickness are associated 
with the limestone. 
A quarry about three-quarters of a mile S.S.E. of Hook 
Norton Leys Farm, showed the junction of the Forest Marble 
and Great Oolite. The beds, which undulate considerably and 
are much broken up at the surface, were as follows : 
FT. IN. 
fFlaggy and shelly limestones with 
lignite- - - - 1 8 
I Marl and grey clay, with Ostrea Sower- 
Forest Marble -^ byi, &c. 1 6 
I Hard blue and grey shelly limestones, 
and gritty limestone with marly 
(_ patches ; current-bedded in places -19 
* Watford, Warwicksh. Nat. Club, March 14, 1882 ; Vine, Quart. Journ. Geol. 
Soc., vol. xxxvii. p. 385. 
t Proc. Geol. Assoc., vol. v. p. 1 75. See also Tomes, Quart. Journ. Geol. Soc., 
vol. xxxix. p. 173 k 
J Proc. Geol. Assoc., vol. v. pp. 386, 387. 
Ibid., pp. 177, 178. 
Great Oolite 
