﻿Vol. 6 1 



CONTIGUOUS DEPOSITS OF GLAMORGANSHIRE, 



401 



tf 



Thickness in feet 

 I Sandstone, light-grey, fine-grained, 

 calcareous. 

 Shales, black, thinly -laminated, 

 weathering brown, and con- 



^ taining thin gritty layers 1 



5 b. Limestone, grey, massive, with 



muscovite-flakes 



6. Parting, usually of shale, sometimes 



impure limestone 



7. Limestone, grey, massive 



8. Shale, black, weathering brown, 



thinly laminated, with a few gritty 

 layers 



9. Limestone, grey, thinning out in 



places, often arenaceous 



1( , /'Shales, black, laminated, with^ 

 , j several gritty layers near the top, I 

 ,4 j and at the base, towards the | 

 1^ eastern end of the section, a )■ 2 



/'Massive bed of conglomerate (see J 

 ir J p. 402); to 8 inches ; 



{ Hard band of grit : 1 to 3 inches . 



16. Shales, black, with gritty layers con- 



taining a few fish-scales (indeter- 

 minable) 



17. Limestone, hard, grey, slightly sandy 



in places, usually in two beds 

 with a little shaly matter inter- 

 vening between them 



| IS. Marl, greenish-grey and bluish,^ 

 imperfectly laminated. Near the | 

 top are little lumps of a hard )■ 1 

 limestone simulating Carbon- j 

 iferous Limestone ) 



/'Limestone, hard, compact, greyish- N 

 green, sandy, resembling, 

 ; I from a distance, Carbon- 

 j | iferous Limestone : containing )-0 



-{ occasionally fragments of a white j 

 j j earthy marlstone and small | 



J j quartz -pebbles J 



I Marlstone, yellowish-green; visible 

 ^ { in the gutter 



■lies. 



Pteria (Avicula) con- 

 tort a (two specimens). 



2 ( Pecten (Chlamys) valo- 



| niensis, Schizodics 



1 { Ewakli ; Acrodus mini- 



| mus, teeth and scales 



of Gyrolepis Albert i. 



I 



( Pecten (Chlamys) valo- 

 6 \ niensis, Placunopsis 

 [ alpina (large). 



4 Much shell-debris. 



|" Pecten (Chlamys) valo- 

 1 \ niensis, Pteria (Avi- 

 \ cula)contorta,c(yprolite. 

 ( Acrodus minimus (com- 

 mon), Saurichthys 

 acuminatus, ( 8argodo?i 

 5\ tomicus' (Lepidotusl), 

 ichthyodorulite of 

 Hybodus ; casts of a 

 lamellibranch of Schi- 

 zodics-type ; wood. 1 

 Schizodus ? (casts). 



(Pteria (Avicula) con- 

 * j torta ; a few fish-scales 

 | (Gyrolepis ?) and co- 

 ^ prolites (fish). 

 ( Hybodus minor (1 tooth), 

 j Gyrolepis Alberti 



I (scales, rare) ; Pteria 

 4 \ (Avicula) contorta, 

 \ Modiola, fragments of 

 | lamellibranchs, and 

 ^ carbonaceous matter. 



(Acrodus minimus (com- 

 I mon), ' Sargodon to- 

 10 { micus' ( Lepidotus ? ) , 

 | fish-scales (fragments 

 ^ common). 



From a lithological standpoint the Tregyff section presents many 

 features of interest. At the base are hard marlstones which are best 



1 All from the Conglomerate-Bed. 

 Q. J. GK S. No. 243. 



2g 



