﻿34 MR. T. F. SIBLT Olf THE TAXTNAL SUCCESSION IN THE [Feb. I908, 



4. The Faunal Succession in the Caebonifeeous Limestone (TJppee 

 Avonian) of the Midland Area (Noeth Derbyshire and North 

 Staffordshire). By Thomas Franklin Sibly, B.Sc, F.G.S. 

 (Read December 4tb, 1907.) 



[Plate I — Fossils.] 



Contents. 



Page 



I. Introduction 34 



II. The Typical Sequence of the Midland Area 37 



III. The Faunal Succession 42 



(1) Bihunophyllum 0-Subzone. 



(2) Lonsdalia-^ubzonQ. 



Variation of the Faunal Facies of the Lonsdalia- 

 Subzone. 



(3) Cyathaxonia-S>xihzone. 



IV. Description of certain Sections of the io«sfZafe-Subzone : 



Variation of the Lithological Facies 63 



V. Description of certain Sections of the Cyathaxo7iia-^\xbzone : 

 Relation of the Cyathaxonia-^xxhzoue to the Pendleside 



Series 57 



VI. Local Unconformity between the Carboniferous Limestone 



and the Pendleside Series 63 



VII. Comparison of the Faunal Succession in the Midland Area 



with that in other Areas 64 



VIII. Summary of Conclusions 68 



IX. Description of certain Corals and Brachiopods from the 



Midland Area 69 



I. Introduction. 



The area of Avonian rocks with which this paper deals, and which 

 I term the Midland Area, includes the large, irregularly-shaped 

 periclinal mass of Carboniferous Limestone, forming the southern 

 termination of the Pennine anticline, south of the Peak, and com- 

 prises also a few small inhers adjacent to this main outcrop. (See 

 map, fig. 1, p. 35.) The main part of this area is included in 

 Derbyshire, but a small, south-western portion lies in Staffordshire. 

 In the Geological-Survey Memoir on North Derbyshire, the 

 Carboniferous-Limestone succession of this area, as shown by the 

 extensive section between Buxton and Monsal Dale, is briefly 

 described ^ ; details of a few other sections are given ^ ; and the 

 nature of the junction between the Carboniferous Limestone and 

 the overlying shales, as seen at various points, is discussed.^ An 

 account of the elementary tectonics of the area, and of the general 

 features of the Carboniferous Limestone, is contained in a paper by 

 Mr. H. H. Arnold-Bemrose, entitled ' A Sketch of the Geology of 

 the Lower Carboniferous Rocks of Derbyshire,' published in the 



1 ' Geology of the Carboniferous Limestone, &c., of North Derbyshire ' 

 Mem. Geol. Surv. 2nd ed. (1887) pp. 18-21 k pi. ii. 



2 IHd. pp. 21-24. 3 Ibid. pp. 26-33. 



