Hind : Carhoniferoiis Geology. 



169 



Corals. 



Palceacis humilis. I Pleiirodictyum decheanum. 



Zaphrentis cf. Z. enniskilleni. \ 



Cephalopoda. 



Prolecanites compvessus. | Nomismoceras spirorbis. 



,, mixolohiis. 1 Pericyclus sp. 



Lamellibranchiata. 

 Choenocardiola footii. 



Brachiopoda. 



Chonetes cf. laguessiana. \ Productus plicatus Sarres. 



and many Radiolarians. 



These beds are succeeded by black shales and limestones 

 at Venn, which are crammed with Posidonomya hecheri. The 

 fauna they contain is sparse in species, and is as follows : — 



Posidonomya hecheri. I Glyphiocevas striatum. 



Pseudamusium fibrillosum. | sphoericum. 



Glyphioceras spirale (upper part) I Orthoceras cylindraceum. 



,, crenistria. \ 



and plant remains. 



These limestones are succeeded by the Middle Culm Grits, 

 which contain plant remains. Above them comes a most 

 interesting series of beds, best seen on the shore at Instow and 

 near Clovelly, which contain concretions which yield the 

 following fauna : — 



Pterinopecten papyraceits. \ Dimorphoceras gilbertsoni. 



Posidoniella Icevis. \ Orthoceras sp. 



Gastrioceras listeri. I CcBlacanthus elegans. 



,, carbonarium. \ Elonichthys aitkeni. 



A fauna with the distinct facies of the Lower Coal Measures 

 of Lancashire : and above this are the beds known as Upper 

 Culm, which contain a typical Coal Measure Flora and Fauna 

 Carbonicola acuta and C. aquilina. 



The fauna here demonstrates a succession beginning with the 

 Coddpn Hill beds, with zone fossils indicating these to be the 

 homotaxial equivalent of the Pendleside Series of the Midlands, 

 and passing up into Coal Measures, where, unfortunately, 

 coals are conspicuously absent, and only represented by the 

 beds of Culm, which were once worked for painters material. 



In the South of Devonshire, and passing West from Exeter 

 to Cornwall, that portion of the Culm Series characterised by 

 Glyphioceras spirale is present. The Codden Hill or Prole- 

 canites compressus beds appear to be present, and to be cherty in 

 character, and are characterised by the presence of Glyphioceras 



1909 May I. 



