496 MR. M. ODLING ON THE [Oct. 1913, 



Thickness in feet inches. 



( Beds 5-10. Compact white limestones, with local marl-partings 10 



Bed 11. ' Second Terebratula Bed,' as in Gibraltar Quarry ... 2 



Beds 12-15. Compact limestones 2 9 



Bed 16. Brown limestone, passing down into 'Nerincea Eock' 2 6 



o ■{ Bed 17. Laminated marl 6 



— Bed 18. Limestone, yielding numerous teeth and part of a 

 m lower jaw of Teleosaurus breviclens Phil. ; also teeth 



of Strophodus and Pycnodus 1 9 



(^ Beds 19-20. Sandy limestones, with marl above 2 6 



Base of quarry. 



The green clay, Bed 2 in Block 1, is of especial interest, since it 

 is from this hed that the remains of Cetiosanrus oxoniensis PhiL 

 were obtained ; as this bed underlies the ' Fossiliferous Cream 

 Cheese,' the specimens must have been obtained from the Great 

 Oolite, not from the Forest Marble. 



The beds down to the top of the 4 First Terebratula Bed ' were 

 originally included in the Forest Marble by Phillips, 1 but afterwards 

 included in the Great Oolite in his ' Geology of Oxford, &c.' 



{ff) Gibraltar Quarry 2 (fig. 3, p. 497). 



A very complete section is afforded in this exposure ; but, as the 

 face of the quarry is almost vertical, a detailed collection from 

 some of the beds proved to be impossible. The details of the 

 eroded surface of the Great Oolite were originally more easily 

 observable in this section than in any of the others, since the 

 Forest Marble was quarried back much farther than the Great 

 Oolite, thus leaving a large platform. Unfortunately, quarrying 

 operations have now been carried down into the Great Oolite. 

 The section in Gibraltar Quarry is as follows : — 



Thickness in feet inches. 



Subsoil of rubbly Cornbrash, with the usual fossils 1 to 2 



Forest Marble. 



Bed a. False-bedded, coarse, oolitic limestones 3 6 



Bed b. Horizontally-bedded clay 1 3 



Bed c. False-bedded limestones and clays 1 6 



Bed d. Horizontally-bedded marly limestones 1 6 



Bed e. Compact limestone, false bedding shown on weathering ... 2 



Bed/. Horizontally-bedded marly oolite 1 



Bed q. Compact limestone, false bedding only apparent on weather- 

 ing 2 



Bed h. Horizontally laminated marl 10 



Bed i. False-bedded limestones and clays 7 6' 



Beds/ k, Horizontally-bedded alternations of limestones and 



l,m,kn. marls in five bands 8 



Well-marked eroded surface with Ostrea. 



1 Q. J. C. S. vol. xvi (1860) p. 118. 



2 This section has been described by C. J. Bayzand, Proc. Geol. Assoc, vol. xxi 

 (1911) pp. 3&4, also pi. ii. Unfortunately, the divisions marked alongside the 

 photograph are incorrect, and most of the fossils recorded from the Forest 

 Marble on p. 3 (op cit.) come from Bed 5 of the Great Oolite. 



