Vol. 67.] FATJNAL HOKIZONS IN THE BKISTOL COALFIELD. 



31' 



(1) South Liberty Colliery, Bedminster. 



The shaft of this colliery passes through 100 feet of Trias at the 

 surface, and penetrates the Lower Coal-Measures to a depth of 

 1386 feet. A generalized section of the shaft is as follows : — 



Feet. Feet, 



To Bedminster Top Vein 630 630 



To Bedminster Great Vein 120 750 



To Toad Vein 396 1146 



To Ashton Great Vein 240 1386 



By the courtesy of the Directors of the Ashton Vale Coal & Iron 

 Company, aud of their manager, Mr. A. Fisher, from whom 1 have 

 received every assistance, I was able to obtain the services of several 

 miners, who cut out for me a measured section from the top of the 

 Ashton Seam upwards to the Bedminster Great Vein. 



The material thus obtained was afterwards examined with the 

 greatest detail. In all, 760 feet of shale, sandstone, etc. were cut 

 oat and worked over, but the results were disappointing. Four 

 faunal horizons were determined, the suite of fossils in each being 

 very small, and the fossils much reduced below the normal size of 

 the species, except in the case of Anihracomya. 



The detailed section cut out was as follows, the beds being 

 arranged in descending order : — 



Examined Section at South Liberty Colliery (in descending order). 



Thickness in feet inches. 



46. Bedminster Great Vein 3 



Massive well-bedded bituminous coal. 

 45. Dark grey fireclay, with small ironstone nodules and abun- 

 dant Stigmarian rootlets 7 6 



44. Mudstone, with a 3-iuch band of cannel-like shale 42 9 



Lower part crushed. 

 43. Shale and mudstone. Dark grey, much slickensided and 



bearing traces of piants 15 6 



42. Sandstone. Grey, micaceous, and current-bedded 5 3 



41. Fireclay. Hard, compact, with ironstone nodules and 



Stigmarian rootlets 8 



40. Coal. Soft and friable 3 2 



39. Grey grit with mudstone, the former showing laminations 



of coaly matter, the latter bearing Stigmarian rootlets ... 14 9 



38. Fireclay with rootlets 12 



37. Mudstone, much slickensided and with rootlets 22 1 



36. Black shale. ' Marine Band,' ' Horizon 4.' Much slicken- 

 sided ; yielding obscure plant-remains, also Carbonicola 



cf. acuta and Anthracomy a phillipsi 3 6 



35. Mudstone 8 



34. Gritstone. Massive, well-bedded, full of calcite-veins and 



pyrite 10 6 



33. Grits and mudstones. Thickness in feet inches. 



Dark-grey micaceous grit 6 



Micaceous mudstone with plant-remains ... 12 6 



Massive grit 1 10 



Mudstone : 10 3 30 7 



32. Black and grey shales, with Lepidodendroid twigs and leaves . 22 6 



