FOSSIL CORALS. 95 



the Gault, but has a few characteristic fossil corals 

 of its own, such as Micrabacia, Cyclolites, Podoseries, 

 etc., which are allied to the Madrepores, and are 

 therefore indicative of warm water conditions. Cyclo- 

 lites Fittoni is common in the Gault beds at Folke- 

 stone. 



Parasmilia, Ccelosmilia, Trochosmilia, Caryophyllia, 

 etc., are characteristic of the Upper White Chalk of 

 Britain. The latter coral is plentiful at Dunstable ; in 

 the chalk pits near Charlton railway station ; and also 



Fig. 76. Litharaia, an Eocene Coral. 



near Lewes. Trochosmilia is most abundant in the 

 Norwich Chalk, which perhaps occupies the highest 

 strati-geographical position in the Cretaceous system of 

 Great Britain, its fossil corals having an appearance 

 which reminds the geologist of those found in the still 

 later formation of Faxoe, in Denmark. The chalk 

 cliffs at Trimingham, on the Norfolk coast, about 

 fifteen miles from Norwich, contain the same peculiar 

 coral fauna. The corals are frequently found im- 

 bedded in flints, and I have specimens in which the 



