10(3 ME. L. M. PARSOXS OX THE CAEBOXIFEROUS [vol. Ixxiil, 



YII. Summary or CoxcLrsioxs. 



In the district immediately north of the Leicestershire Coal- 

 field :— 



1. There is a complete conformable sequence from the Carboni- 

 ferous Limestone to the Millstone Grit inclusive, although the 

 thickness of the beds of Pendleside aspect is small compared with 

 that of the same formation in other districts. 



2. The base of the Carboniferous Limestone is not seen, but 

 borings have proved that it rests on pre- Cambrian rocks at Desford, 

 in the neighbourhood of Charnwood Forest. 



3. The total thickness of Carboniferous Limestone seen is about 

 900 feet, all of it included in the DihiinopliyUum Zone, the sub- 

 zones recognizable being D^, D^, and possibly part of Dg. 



4. Faunal characters indicate that the Carboniferous Limestone 

 belongs to the Midland Province, but that it more closely resembles 

 the non-typical development occurring in the south-western part 

 of the Main Area of that province. The development is not the 

 normal facies characteristic of the greater part of Derbyshire, and 

 the various inliers described in this paper must be regarded as a 

 south-eastern extension of the Caldon-Low facies so far as D^ is 

 concerned, and of the Waterhouses facies as regards the portion 

 above D^. 



5. The normal limestones of the Midland Province are repre- 

 sented by dolomites due, probably, to shallow-water conditions of 

 deposit. 



6. The great mass of dolomite is of contemporaneous origin, 

 only certain beds of a high horizon, D.^-D^, being dolomitized 

 subsequently. 



YIII. Paljeoxtologtcal Xotes. 



It was my intention originally to give a detailed account of 

 certain new species, chiefly of Caninia, Zaplirentis, and Syriitgo- 

 20ora, in connexion with the present paper ; but it will be better to 

 deal with the matter sepai-ately. A fcAv notes, however, are 

 added to explain one or two items occurring in the faunal lists. 



The Ticknall exposures yield a variety of Zaphrentids which 

 include forms that resemble Zaplirentis oi/sfermo2(fhensis Yauglian, 

 found associated with Z. cnnisl'iUeni in beds of Dg-D., age in the 

 Gower district of the South- Western Province.^ In the Ticknall 

 specimens, the following characters indicate the similarity. The 

 calyx is deep. The fossula is on the concave side, and extends 

 more than half-Avay across the diameter of the coral. Great 

 variation in the length of the major septa is observable, and these 

 septa are strongly convex towards the fossular break. The tabulje 

 are strongly depressed in the middle. The above description refers 

 to adult specimens, which are usually about 4 cm. long. Although 

 the septa are thickened, this feature does not appear to be quite so 

 pronounced as in the Gower specimens. 



^ E. E. L. Dixon, 'The Carboniferous Succession in Gower' Q. J. G. S. 

 vol. lxvii(1911) p. 5.53. 



