﻿374 ME. LINSDAIL EICHAEDSON ON THE [Hay 1905, 



17. The Rh^tic Rocks of Monmouthshiee. By Linsdall 

 Richardson, F.G.S. (Read March 22nd, 1905.) 



[Plate XXXII — Vertical Section.] 



Contents. 



Page 



I. Introduction 874 



II. Description of the Sections. 



(A) Goldcliff 374 



(B) Bishton 377 



(0) Llanmartin 380 



(D) Llanwern 380 



(E) Milton 381 



(F) Bishpool 382 



(G) Lis-Werry 382 



III. Conclusion 383 



I. Introduction. 



In Monmouthshire the Rhsetic does not extend over a large area, 

 and occurs only in the neighbourhood of Newport. Here it has 

 attracted very little attention until quite recently, when the resurvey 

 of the South-Wales Coalfield necessitated a fresh examination of the 

 deposits, in order to complete the geology of Sheet 249 (New Series). 

 Certain sections which came within the area were described, but 

 hardly in sufficient detail, as the only lamellibranch recorded was 

 Modiola minima. 



In the present paper four new sections and three new exposures 

 are described : the Goldcliff and Lis-Werry sections being included 

 in the former category, because hitherto comparatively little was 

 known about them. 



II. Description oe the Sections. 



(A) Goldcliff. 



About 3| miles to the south of Llanwern Station, and rising 

 from the alluvial flat called Caldicot Level, is the little inlier of 

 Keuper, Rhsetic, and Lower Liassic rocks denominated Goldcliff. 

 Although the occurrence here of Rhaetic and Lower Lias has long- 

 been known to geologists, details of the section have been difficult 

 to obtain ; and, until the present time, it has been possible to 

 investigate only the basement-beds of the Rhsetic and those at the 

 base of the Lower Lias. This is due to the fact that the cliff had 

 to be faced with masonry, in order to continue the sea-wall. 



About the year 1824 Buckland & Cony beare noted the occurrence 



