154 



Hind: Carboniferous Geology. 



Bagillt road, Nant-figilt afford an exposure of about looo feet, 

 and yield a typical Pendleside fauna. They are succeeded by 

 sandy and micaceous shales of Talacre dingle, and these are 

 overlaid by the Gwespyr sandstone, which is a very thick bed 

 of sandstone full of plant remains in a detrital state. 



I consider it probable that the Gwespyr sandstone is the 

 representative of the Millstone Grit, but we have no fossil 

 evidence yet whether this is a Sandstone above or below that 

 horizon, but there is little doubt that the Coal Measures of 

 North Flint contain the representative of the Arley mine of 

 the Lancashire Coalfield. 



THE MIDLANDS. 



The Carboniferous sequence of the Midlands is important. 

 The area over which this particular sequence obtains extends 

 from Ashbourne in Derbyshire to Settle in Yorkshire, and is 

 represented in the following diagram : — 



Gastrioceras listrri. 

 Glyphioceras hilingue beds 



Glyphioceras spirale beds. 

 Glyphioceras reticulatum beds. 

 Posidonomya hecheti beds. 

 Prolecanites cornpressus. 

 Cyathaxonia beds. 



Upper Dihunophyllum. 



Lower Dihunophyllum. 

 Base never seen. 



The base of the Limestone has never been seen, and owing 

 to the Tectonic structure of the area, we are totally ignorant 

 of the thickness of the Limestone, or on what rocks it is super- 

 posed. Having collected Carboniferous Limestone fossih for 

 many years in this area, I was aware that I had never obtained 

 a fauna from which Pro ductus giganteus was absent, and that 

 the upper part of the Series was very rich in those corals 

 which Dr. Vaughan associated with the Dihunophyllum zone. 



Naturalist,- 



Millstone Grits 



Pendleside Series 



Carboniferous Limestone 



