﻿Vol. 6 1.] 



KH2ETIC KOCKS OF MONMOTTTHSHIKE. 



379 



Continuing now along the Llanmartin road, a barn will be noticed 

 on the left-hand side, and in a hollow near by a Rhsetic sandstone- 

 bed is exposed. Owing 



P\\ too • ^° ^ e f° rma ^ on °f 

 travertine, however, it 



is difficult to obtain 

 any reliable details. 



A little farther on, 

 there is a cottage on 

 the right ; and a short 

 distance beyond again 

 an exposure, showing, 

 in descending order, 

 black shales, a hard 

 blackish limestone 



crowded with well- 

 preserved specimens of 

 Cardium cloacinum, 

 and less commonly 

 with Schizodus Ewaldi, 

 Protocardium Philip- 

 pianum, Placunopsis 

 alpina, and Gyrolepis 

 Alberti, while below 

 are black shales. The 

 limestone-bed corre- 

 sponds to 5 b (3) at Bish- 

 ton. Another exposure 

 a little farther on in the 

 direction of Llanmartin 

 shows the Cotham- 

 Marble equivalent, with 

 pale marly shales below 

 and hard light-brown 

 paper - shales above. 

 Immediately below the 

 Cotham-Marble equiva- 

 lent is a thin bed of lime- 

 stone, full of Modiola 

 minima. 



About a quarter 

 of a mile south-west 

 of Llanmartin the 

 road passes through a 

 cutting, in the north- 

 western bank of which the following section is exposed (see also 

 fig. 1) :- 



