K. F. TOMES ON THE GEEAT-OOLITE MADEErOEAEIA. 



173 



I shall only attempt to correlate the coralliferous beds of these 

 several localities so far as to show that they are not all on the same 

 horizon. 



Assuming that the Fairford coral-bed lies at the base of the Corn- 

 brash, of which there can be but little doubt, the Burford one must 

 be regarded as of a somewhat earlier date, as it is unquestionably 

 below the Forest Marble. Both are, however, in the upper division 

 of the Great Oolite. It is probably from about the same horizon as 

 the Burford coral-bed that the Great-Oolite corals of the Bath dis- 

 trict have been obtained, the late Mr. C. Moore having assured me 

 that a great many of them were taken from beds which were the 

 equivalent of the Bradford Clay. 



But the coral-bed in the railway-cutting near Stonesfield is ob- 

 viously of an earlier date than those above mentioned ; for it lies 

 under the beds constituting the great mass of the middle division of 

 the Great Oolite. These may be seen well exposed in a quarry a 

 little southward, while to the north of the railway are the exca- 

 vations for the underlying Stonesfield Slate. The band of corals in 

 the railway-cutting at Aylworth lies directly upon the Stonesfield 

 Slate. 



As already stated, the bed of blue clay underlying the coral layer 

 at Stonesfield, and which is evidently an ancient oyster-bank, com- 

 pletely separates the overlying corals from the one solitary species, 

 Cyathophora Bourgueti, which underlies it. And it may be further 

 observed that although in the Bollright cutting, which is certainly in 

 the lower part of the Great Oolite, the same underlying solitary coral 

 does not occur, nevertheless it does appear in another cutting not 

 far from Eollright in the same unassociated way, and in a position 

 consistent with the bottom of the Great Oolite. This is, as I have 

 already stated, at Hook Norton, in what has been denominated the 

 "rifted" bed, resting upon the Inferior Oolite, with which it has 

 sometimes been classed. 



Assigning, therefore, to the above species, Cyatlwpliora Bourgueti, 

 a place quite apart from that of other Great-Oolite corals, the other 

 species may be tabulated as follows : — 





1. 



2. 



3. 



4. 



5. 



6. 



7. 



Enallohelia clavata 



Bathyccenia Slatteri 



sohda 







* 



-* 



* 



■Sf 



* 





* 



* 



* 



* 

 * 



* 



Cryptoeoenia Fratti 



* 



tuberosa 



microphylla 



Stylina conifera 



solida 



Convexastrrea Waltoni 



MontKvaltia Slatteri 



■ fairfordensis 



caryophyllata 



Calamophyllia racliata 



Thccosmilia Slatteri 





