" " '-22 
GREAT OOLITE | BATH. 265 
and many Brachiopoda occur in the Coral-bed, which is 
separated from the freestone beds of the Great Oolite, by 5 feet 
of compact grey limestone yielding Lima cardiiformis, Trichites, 
Lithodomi, Polyzoa, and many Corals, and is overlaid by 4 or 5 
feet of thin-bedded oolite.* 
The beds of rubbly stone and ma,rl, yielding Bradford Clay 
fossils, that here, and also at Combe Down occur on top of the 
Great Oolite, form an intimate link between that formation and 
the Forest Marble; and the upper beds of the Great Oolite 
above the freestone do not exceed 20 feet in thickness. 
On Combe Down, near Lodge Hill (Prior Park), and St. 
George's Cross, there are several quarries where the following 
sequence was shown : 
FT. IN. 
'Eubble or Eidding ; bands of 
rotten stone and marly beds with 
fossils ; (some beds used for road- 
Upper Division. -^ metal) - - 10 to 12 
Layer of large specimens of Ostrea. 
Eag Beds ; hard and rubbly lime-") 
stones 
"Picking Beds (used for ashlar) 
Cockly Bed, with fossils - - J 
Lower Division. ^ Freestone (in places divided into 
3 weather-beds and a bottom-bed) 
10 to 14 
The Eag, Picking, and Cockly beds are hard smooth -jointed beds, more 
or less oolitic. 
In a section recorded by Lonsdale,f he notes that beneath 
the " Cockle Bed " there was from 25 to 30 feet of good 
freestone, and under that 10 feet of Lower Rags. The total 
thickness of freestone and Lower Rags does not exceed 35 feet. 
There is no doubt that in detail the beds vary very much indeed ; 
what is called the Ridding or Riddingtop, is simply the weathered 
and rubbly stone or " Head " above the workable material, and 
it sometimes directly overlies the freestone beds ; it is the material 
that has to be got rid of in the quarries, before the good stone 
can be obtained. The freestone which is minutely false-bedded 
in places, contains darker veins of shelly matter, with recogniz- 
able fragments of Ostrea and Pccten. The Cockle Bed (according 
to Lonsdale) contains Corals, and apparently from the same bed 
Mr. Tomes and Mr. T. J. Slatter have obtained a number of 
species.J This layer, which directly overlies the good freestone, 
also contains drusy cavities, lined with calc-spar ; and there is a 
specimen from Box now in the Museum at Jermyn Street, show- 
ing one of these cavities, evidently due to the dissolution of a 
mass of. Coral, portions of which are to be seen in the stone. 
From a quarry near St. George's Cross I collected the 
following fossils from the upper rubbly beds of stone and marl, 
* Moore, Geologist, vol. iii. p. 443 ; H. Jelly, Mag. Nat. Hist., 1839, p. 551. 
f Trans. Geol. Soc., ser. 2, vol. iii. p. 252. 
j Quart. Journ. Geol. Soc., vol. xli. p. 174. 
