﻿548 ME. T. E. SIBLT ON THE CAEBOSIFEEOTTS [Aug. I905, 



25. The Caebontfeeotts Limestone of the Weston - supee - Maee 

 Disteict (Someeset). By Thomas Feanklin Sibly, B.Sc. 

 (Communicated by Dr. Aethue Yaughan, B.A., F.G.S. Bead 

 May 10th, 1905.) 



Contents. 



Page 



I. Introduction , 548 



II. The Weston-Worle Eidge 549 



(1) Topography and General Stratigraphy. 



(2) Detailed Stratigraphy. 



(3) The Faunal Sequence. 



III. The Woodspring Ridge (Middle Hope) 558 



IV. Comparison with Neighbouring Areas 559 



V. Summary 560 



I. Inteoduction". 



Weston-supee-Maee lies 16| miles W. 25° S. of Clifton Suspension- 

 Bridge. The Carboniferous Limestone in the neighbourhood forms 

 two ridges which stand up prominently from the surrounding 

 alluvial flats. The southern ridge, which I term the Weston- 

 Worle ridge, runs a little north of east from the coast, at Weston, 

 to Worle, and is about 3 miles in length. The northern and 

 smaller ridge, known as Middle Hope (the Woodspring 

 ridge), lies 2 miles farther north, is about 2 miles in length, and 

 runs almost parallel to the Weston-Worle ridge. 



The occurrence of contemporaneous igneous rocks associated with 

 the Carboniferous Limestone both at Weston and at Middle Hope, 

 lends especial interest to the district. The igneous rocks have been 

 described by Sir Archibald Geikie and Mr. Aubrey Strahan, 1 and 

 also, more fully, by Prof. C. Lloyd Morgan & Prof. S. H. 

 Reynolds. 2 The Spring-Cove lava (Weston) has, further, been 

 fully described by Prof. W. S. Boulton. 3 



The present paper is devoted chiefly to a detailed description 

 of the Weston-Worle ridge. My object in examining the district 

 was an investigation of the coral- and brachiopod-succession in the 

 Carboniferous Limestone, in connection with my work in the Mendip 

 area, and in continuation of the work accomplished by Dr. Arthur 

 Yaughan 4 in the Bristol area. In order to accomplish this with 

 thoroughness in the Weston-Worle ridge, much detailed strati- 

 graphical work has been necessary, owing to the fact that faulting 

 and resultant folding have complicated the structure of the ridge, 



1 ' Summary of Progress of the Geological Survey for 1898 ' pp. 104-11. 



2 ' The Igneous Eocks associated with the Carboniferous Limestone of the 

 Bristol District ' Quart. Journ. Geol. Soc. vol. lx (1904) pp. 137 et seqq. 



3 Ibid. pp. 158 et seqq. 



4 See ' The Palseontological Sequence in the Carboniferous Limestone of the 

 Bristol Area ' Quart. Journ. Geol. Soc. vol. lxi (1905) pp. 181 et seqq. 



