R. F. Tomes — Inferior Oolite Madreporaria. 389 



Leptopfiyllia, sp. (Podoseris constricta, Duncan). The type-specimen 

 of Podoseris constricta, which was for some time in my hands, has 

 so much the appearance of the Burton Bradstock specimens that I 

 have no doubt that it was obtained from that place. It is stated to 

 have come from the Lower Bagstone of Dorset, which I presume is 

 the zone of Am. ParMnsoni, the zone from which the other Burton 

 Bradstock Corals here mentioned have been obtained. 



Thamnastrcea Defranciana. A single example from the Inferior 

 Oolite of Dorset is in my collection, but I do not know either its zone 

 or exact locality. 



Dimorpharcea Oolitica, Duncan, sp. Occurs at East Coker, and is 

 common ; also at Stoford near Yeovil, in the zone of Am. Sowerbyi. 



Dimorpharcea Beanii (Cyclolites Beanii, Duncan). Occurs in the 

 paving-bed of the Bradford Abbas quarry, in the upper part of the 

 zone of Am. Murchisoni. 



Dimorpharcea expansa, n.s. East Coker, the zone not ascertained. 



Microsolena, a small globular species. Two examples have been 

 met with, one from the paving-bed at Bradford Abbas, and the other, 

 although said to have been collected at the same place, has so much 

 the appearance and colour of the Burton Bradstock Corals as to 

 leave little doubt that it came from there. 



The number of Turbinolidce in the above list, occurring so low 

 down in the Inferior Oolite of Dorset and Somerset, is rather re- 

 markable, and would seem to indicate a continuous period from the 

 Upper Lias upwards, the conditions of which were favourable to the 

 growth of these small Madreporaria, and which did not prevail 

 during the formation of corresponding deposits in the Gloucester- 

 shire and Oxfordshire areas. The general resemblance between the 

 Turbinolidce of the Upper Lias and those of the Inferior Oolite of the 

 Western Counties of England is very obvious. 



The following section at present exposed in the quarry at Bradford 

 Abbas was taken by me a few months since, and although it does 

 not materially differ from those already given by Mr. S. S. Buckman l 

 and Mr. Hudleston, 2 is repeated here for the purpose of showing all 

 the more correctly the position of the Corals in it. 



1. Surface soil ... 



2. Shattered stone and rubble 



3. Stone in nodular layers, divided by thin irregular layers of marly 



shale ... 



4. Soft stone ... 



5. Marly shale; the "Marl bed" of S. S. Buckman. Contains 



Trochocyathns magnevilliamis ... ... ... ... ... 2 



6. Gasteropoda bed, consisting of hard subcrystalline stone, which is 



thin and ragged and blue in the middle. It is overlain by a 

 soft friable layer. It contains Gasteropoda of great beauty, 

 and a considerable number of small sponges ... ... ... 9 



7. Yellowish compact limestone 2 



8. Paving-bed, containing the following corals : — Monti ivaltia 



cupuliformis, M. lens and another species undetermined, 

 Latimceandra Flemingi, a compound coral allied to Isastracea, 



1 Quart. Journ. Geol. Soc. vol. xxvi. p. 591. 

 3 Proceed. Geol. Assoc. 1885, p. 198. 



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