﻿Vol. 6 1.] CONTIGUOUS DEPOSITS OF GLAMORGANSHIRE. 409 



Thickness in feet inches. 



1. Clay, with, yellow and hard grey limestone-nodules; 

 Pentacrinus - ossicles, Pseudodiadema-vndiole ? ; Lima 

 (Plagiostoma) gigantea, L. (Badula) pectinoides, Uni- 

 cardium cardioides, Modiola minima, Ostrea cf. Uassica, 

 Pholadomya glabra ; DcntaUum etalense, gasteropods ; 

 Psiloceras Jo'hnstoni seen 3 6 



2. Limestone 



3. Shale, dark 



4. Limestone, yellowish, nodular; Psiloceras Johnstoni ... 





i). 







5 







7 



1 



8 







8 



2 



7 







6 



L8 











10 







8 







10 



Shale, dark 

 C>. Limestone, bluish, mixed with shaly matter 2 



7. Shale, dark, usually persistent .. 



8. Hard blue limestone, with a little shaly matter ; Ostrea 

 Uassica, Psiloceras planorbis [seen in 1905, 8 feet; add 10] 



9. Conglomerate-bed 



I 10. Limestone-shales 



Hard compact limestone (resembling the Sun-Bed) 



Shaly parting. 



Hard, compact, and rather shaly limestone 8 



Black shales, with thin bands of limestone ; Pccten valoni- 



ensis 1 



Grey and greenish marls, with hard nodules (formerly 



used for cement) seen to a depth of 3 6 



[A. specimen of Galoceras intermedium (Portlook) was found, 

 but not in situ.'] 



In addition to Mr. H. B. Woodward, 1 several other authors have 

 described this section. H. W. Bristow wrote : 



' The section at the Stormy Cement- Works . . . shows about 20 feet of 

 ordinary Lias limestone and shale, resting upon 2 feet of a hard, siliceous, and 

 shelly blue conglomerate, under which occur from 12 to 15 inches of pale 

 argillaceous limestones, breaking with a smooth conchoidal fracture, and which 

 I believe to represent the " White Lias " or uppermost member of the Rhajtic 

 Series.' (Quart. Journ. Geol. Soc. vol. xsiii, 1867, p. 204.) 



Charles Moore, in his valuable contribution to our knowledge of 

 the Mesozoic littoral deposits, commented upon the fact that 



' When compared with the West-of-England section, the Bhretic beds at this 

 spot are very insignificant. A single bed of black marl containing Pecten 

 valoniensis and other Bhaatic shells succeeds the variegated marls, and upon 

 this a dark limestone 4 inches, and next a bed (in texture very similar to the 

 " White Lias ") 2 feet thick. The Ostrea-heds then follow ....'' (Ibid. p. 520.) 



In 1884 the late E. F. Tomes recorded in the pages of the 

 Quarterly Journal (vol. xl, p. 359) the following details of the strata 

 below the Ostrea-Beds : — - 



ThicJcncss in feet inches. 

 ' Hard conglomerate, in all respects like the " Guinea ''-Bed of 



Binton 2 to 3 



Fine-grained nodular limestone, with a conchoidal fracture, and 



very much resembling the Est heria-Bed 1 to 2 



Dark-grey Rhaitic shale 1 6 



Greenish, compact Keuper Marl, forming the bottom of the pit.' 



1 ' The Jurassic Rocks of Britain ' Mem. Geol. Surv. vol. iii (1893) p. 114. 



