﻿Vol. 6 1.] CONTIGUOUS DEPOSITS OF GLAMORGANSHIRE. 405 



to the outliers in the neighbourhood of Pendoylan, at Peterston, 

 and St. Pagans. 1 



In the Pendoylan outlier, Mr. Cantrill discovered pieces of 

 Pecten-Iuimestone at a pond 100 yards south-east of the vicarage ; 

 and I found fragments of a similar rock at a pond immediately 

 west of the footpath running from Pendoylan to Ty'n-y-cae, at a 

 point due west of the Tre-sfoch. Mr. Cantrill obtained spines and 

 tubercles of an echinoid (queried as an Acrosalenia), from a Pecten- 

 limestone thrown out from a well-excavation, 80 yards north-west 

 of Pendoylan School. The fact is interesting, because, except for 

 the records of an echinoid (which may be a species of Pseudodiadema) 

 at Coomb Hill near Cheltenham, 2 and at Church Lench (Worcester- 

 shire), 3 I am not aware that such remains have been noticed in beds 

 of contorta-age.* Mr. Cantrill, moreover, observed llhsetic limestone 

 in the soil of a field, at about 150 yards along the footpath running 

 south-eastward from Ty'n-y-cae. Near the hedge at the same spot 

 are shallow excavations, in which fragments of sandstone containing 

 Acrodus minimus, and bits of fish-scales, can be seen. 



In the Peterston outlier Black Shales and P^c^i-Limes tones have 

 been noticed in a brook between Maendy and Allt-isaf, but the only 

 exposure of any interest is at the village of St. Bride's, in a shallow 

 road-cutting near the church. On the west side a considerable 

 thickness of black shale occurs, together with a bed of sandstone 

 crowded with the teeth of Acrodus minimus ; while on the east 

 the ' Tea- Green Marls ' (Keuper) are visible. There is no evidence 

 of the Sully Beds. 



In the sides of a pond about 200 yards west of Pen-hefyd, 

 St. Pagans, Black Shales and a Pecten- Limestone (containing Pecten 

 vcdoniensis and fragments of a Placunoj^sis?) are visible. These 



1 The occurrence of Bhsetic deposits has been noted by the officers of the 

 Geological Survey at certain localities which have not been touched upon in 

 this paper, because, although I visited these loaalities, I did not obtain any 

 additional information. The results of the official investigations are chronicled 

 at the following pages of the memoir on ' The Geology of the South-Wales 

 Coalfield: Pt. iii'— p. 66 (St. George's); p. 66 (Coed-y-gof) ; p. 66 and in 

 Pt. vi (1904) p. 39 (Castell-y-Mynach) ; p. 65 (Saintwell) ; and p. 65 (Vishwell). 



2 ' Handbook to the Geology of Cheltenham ' 1904, p. 210. 

 :? Proc. Cotteswolcl Nat. F.-C. vol. xv (1904) p. 40. 



1 In that part of the memoir on ' The Geology of the South- Wales Coal-field 

 which deals with the Cardiff district (pt. iii, 1902, p. 56) there is the following 

 passage : — ' The fauna includes scarcely any examples of the four great marine 

 orders, Actinozoa being unknown in the Avicida-contorta beds, Echinodermata 

 being represented by one form of feather-star, Brachiopoda by one form of 

 Discina, Cephalopoda by a Beloteuthis, the horizon of which, however, there is 

 reason to doubt.' Later discoveries require this statement to be modified 

 somewhat : in addition to the occurrence of an echinoid in the Pteria 

 (Avicula) -contort a Beds, a compound coral has been described by the late B>. F. 

 Tomes (Quart. Journ. Geol. Soc. vol. lix, 1903, p. 403) ; and I he same author 

 found an imperfectly-preserved Montlivaltia, parasitic on a Modiola in the Black 

 Shales, during the construction of the Penarth Docks {ibid. vol. xl, 1884, 

 p. 363). Charles Moore obtained from his ' Flinty bed ' at Beer Crowcombe, 

 Somerset, a single specimen of a coral, probably a species of Montlivaltia 

 (ibid. vol. xvii, 1861, p. 511). 



