530 ME. T. C. CANTBILL ON SPIEOEEIS-LIMESTONE, ETC., [Aug. 1895, 



(1) The Clent District. 

 The following seems to be the succession in the Clent District : — 



' Permian ' Bocks of the Clent District. 



\ g. Trappoid breccia. 

 I /. Sandstones and marls. 



T> • j r\ i \ e - Calcareous conglomerate. 

 - 2. Breccia and Conglo- , Q j , , & , 



I , r, ° < a. (sandstones and marls. 



Lower Eed | aerate Group 



Sandstone. ■{ 

 [Kothliegende.] I 



Calcareous conglomerate. 

 b. Sandstones and marls. 

 a. Calcareous conglomerate. 

 Lower Sandstones and Marls. 



The breccia has been estimated to be about 450 feet thick, and 

 the remaining beds, below it, not less than 500 feet. 1 Regarding 

 the whole series as consisting of two groups, namely, the Breccia 

 and Conglomerate Group [No. 2], and the Sandstones and Marls 

 Group [No. 1], it would appear from the map 2 that the Breccia 

 and Conglomerate Group is very much thicker and more important 

 than Group 1. 



The Breccia is the remarkable assemblage of angular and sub- 

 angular fragments, chiefly of igneous rocks, embedded in a red marl 

 base. Below it we have at least three well-marked bands of cal- 

 careous conglomerate, separated by sandstones and marls, while 

 below the lowest conglomerate we have sandstones and marls which 

 contain some badly-preserved plant-remains at Hasbury, near Hales 

 Owen, and also near Illey Mill. The whole series, from summit to 

 base, is of a deep red or purplish-red colour. Below the plant- 

 bearing beds are the yellow Hales Owen Sandstones of the Coal 

 Measures, with a Spirorbis-limestone at about 50 feet below, their 

 summit. The change in colour from the yellow Coal Measures to 

 the overlying red ' Permian ' beds is abrupt and unmistakable ; 

 though, so far as I am aware, no marked unconformity has been 

 proved between the two formations. 



(2) The West Bromwich District. 



In this district, 3 on the eastern margin of the coalfield, we have 

 another large area of these red rocks, apparently consisting of re- 

 presentatives of those of the Clent district, but without the Breccia.* 



Now, as early as the time when Jukes was working in South 

 Staffordshire, these red rocks had been pierced in search of coal in 

 several places in the neighbourhood of West Bromwich. 5 



1 Kamsay, Explanation of Horiz. Sect. Sheet 50. 



2 Sheets 54-N.W. & 6&S.W. 



3 See Ketley, Geol. Mag. 1875, pp. 193-198. 

 * See Geological Survey map, 62 S.W. 



5 See Jukes, ' South Staffordshire Coalfield,' 2nd ed. Mem. Geol. Surr. 1859, 

 pp. 11, 12. 



