110 CAEEOXIFEROrS LIMESTOXE OF LEICESTERSHIRE, [vol. Ixxiii, 



The latter are characterized by a detinite fauna, and probably occupy 

 a delinite position in the Carboniferous System. In view of the 

 fact that, outside the Leicestershire area, the top of the limestone is 

 of markedly different horizon in different places, even where it is 

 succeeded conformably by argillaceous strata or by beds of Millstone- 

 Grit facies, it is necessary that the term ' Pendleside Series ' should 

 be confined to beds containing its chamcteristic fauna, otherwise it 

 will become as meaningless as the term ' Millstone Grit.' 



As to the origin of certain dolomites described in the paper, he 

 had found that the corals enclosed in Carboniferous limestones 

 afforded valuable criteria for judging whether dolomitization was 

 ' contemporaneous ' or of later origin (the latter including that due 

 to Triassic infiltration). In ' contemporaneous ' dolomites the coral- 

 tissue resists dolomitization as compared with the matrix, whereas 

 in Carboniferous limestones dolomitized later the corals are altered 

 before the matrix. As the corals exhibited from Breedon were 

 dolomitized, in preference to their matrix, their alteration must be 

 of later age. Possibly the bulk of the rock was altered ' con- 

 temporaneously,' and the process extended, by percolating waters, 

 to the undolomitized organic remains at a later date. 



The Chairman (Dr. A. Smith Woodward) referred to the re- 

 markable state of preservation of the teeth of Elasmobranch fishes 

 obtained from the shales at Ticknall by the late Edward Wilson, 

 F.G.S. They added much to our knowledge of these mre fossils. 



Sir Henry Hoavorth and Prof. W. W. Watts also spoke. 



The ArTHOR thanked the Fellows present for their kind 

 reception of his paper, and expressed his gratitude to Sir Henry 

 Howorth and Prof. Watts for their kind remarks. In reply to 

 Mr. Dixon, he drew attention to evidences of contemjDoraneous 

 dolomitization aff'orded by the bedded nature of the dolomites, the 

 non-existence of any lateral transition into normal limestones, and 

 the absence of any apparent connexion between faulting and dolo- 

 mitization. Fossils obtained from the greater part of the sequence 

 were completeh' converted into dolomite. 



Although the shales lying between tlie Carbonifei'ous Limestone 

 and the Millstone Grit had not yielded a typical Pendleside fauna, 

 these beds had been designated ' Pendleside ' in the paper, in order 

 to compare their de\'elo])ment with that of the strata which occupy 

 a corresponding position in the Carboniferous sequence of Derby- 

 shire. 



