Yol. 67.] WEST, MID, AND EAST SOMEKSET. 59 



About a quarter of a mile due west of the Cemetery is 

 the quarry in the Carboniferous Limestone at Bowlish, in which, 

 adhering to the more or less vertical faces of rock forming the 

 fissure-sides, can often be detected a breccia of Rhsetic age con- 

 taining the small vertebrate- remains characteristic of the epoch ; 

 while, resting upon the planed surface of the Carboniferous Lime- 

 stone (which is here inclined at quite 45°), are the Lower Liassic 

 strata. 



On the north side of the combe, about a furlong and a half 

 south-south-west of the above quarry and at the eastern end of 

 Darshill Mill-pond, an adit was being driven at the time of my visit 

 in connexion with a water-supply scheme. The Langport Beds or 

 White Lias proper were full of the ordinary fossils, such as Volsella 

 minima (Moore), Pleuromya croivcombeia auctt., Ostrea liassica 

 Strickl., etc. The uppermost bed was pierced by peculiar annelid- 

 like borings. A few pieces of greyish rock were also found lying 

 about, which were partly conglomeratic like the bed numbered 3 

 in the Three- Arch-Bridge Railway-cutting (see p. 60). 



The section described by De la Beche as situated ' on the south 

 of Croscombe ' l I have been unable to find, but a mile and a quarter 

 due west of Shepton Mallet Church is an old quarry in the Car- 

 boniferous Limestone, on the top of which limestone are traces of 

 littoral ' Tea-green Marl'; while, in the same field, I picked up 

 pieces of a peculiar granular sandy rock containing unmistakable 

 Rhaetic fish-remains. 



Three-Arch-Bridge railway-cutting, Shepton Mallet. 

 — This, as I have already remarked, is the place where the best 

 exposure of the Rhsetic deposits in the district is available, and the 

 cutting is situated about a mile to the west of the town. 



The line of demarcation between the Keuper and the Rhsetic is 

 sharply defined, and the same remark applies to the upper limit ; 

 but, as noticed by Moore, the Planorbis Beds are very close down to 

 the Langport Beds, and 



1 on comparing the Liassic beds with the Camel Section, it will be at once 

 apparent that the lower members [of the Lias] are absent. . . .' 2 



As detailed records of this section have been given by Moore, also 

 by H. B. Woodward, W. A. E. Ussher & J. H. Blake, 3 it will only 

 be necessary here to give such details as will permit of its being 

 elearly compared with other sections. 



1 Mem. Geol. Surv. vol. i (1846) p. 278. 



2 Q. J. G. S. vol. xxiii (1867) p. 506. 



3 Vert. Sect, Geol. Surv. 1873, Sheet 46, No. 15. 



