Vol. 67.] 



WEST, MID, AND EAST SOMEESET. 



33 



place at which Bristow & Etheridge measured the section, or 

 it may be that the shales were not sufficiently calcareous or 

 indurated there to assume the aspect of a limestone-band. These 

 geologists apparently recognized the equivalent of the Cotham 

 Marble, but recorded only a few inches of shale between it and 

 the next underlying limestone, instead of somewhere about 2 feet 

 2 inches. True, this shale varies somewhat in thickness. This is 

 the main difference, as regards stratigraphical details, between our 

 records ; the other differences are so trivial that a prolonged com- 

 parison is unnecessary. 



Section in the Railway-Cutting at Dunball, near Pueiton. 



Thickness in feet inches 

 C Shales, hard, dark-grey, occasion-^ 

 < ally hardened into stone. (' Lias > — 



(. Pavionrs ') 3 



f' Bottom-Lias.' Limestone, masO e 



■< sive, evenly-bedded, bluish-grey, 



(. argillaceous 



C Paper-shales, hard, pale grey and 



l brown : 22 to 26 inches 



f Limestone, dark grey, rather earthy, 

 3 frequently passing into shale. 

 1 Usually, however, it is a noticeable 

 C bed 



. f Shales, grey, calcareous, more fissile ") 

 ft < here than usual : 3 feet 6 inches to > 3 

 £§ (. 4 feet 2 inches 3 



Sun-Bed, Jew, or Dew Stone. 

 Limestone, very massive, greyish- 

 brown, conchoidal fracture, with 

 1. <( frequently a hard marly limestone 

 3 inches thick, called the ' Slippery 

 Bed,' separating,off from the top : 



10 to 14 inches 



Shale-parting, greyish-green, marly. 

 C Limestone, massive, with a con-") 



< choidal fracture, bluish - grey > 



(. hearted: 8 to 10 inches 3 



/"Marl and very pale grey rubbly 

 3 limestones. Sometimes the lime- 

 j stones are more prominent, parti- 



C cularly one near the top 



C Limestone, dirty grey, rather earthy ~) 



< and irregular, with a hard cap : > 



(. 2\ to 5^ inches 3 



C Marl, pale grey, and thin rubbly ~) fl 

 i limestones : 2\ to 4§ inches ) 



y C Limestone, bluish-grey hearted, yel- ") Q 



(_ lowish exterior, soon breaks up 



8. Shales, pale grey, marry 



q C Limestone, pale grey, rather argil- \ ~ 



* (_ laceous ) 



, q C Shales, grey, often indurated, or 



\ absent altogether 



11. Limestone, hard, dark grey 



}• 



Volsella minima (Sow.). 



, C Pleuromya croiocomheia 

 (_ auctt. 



10 



4 J 



I Paper-Shales; locally 

 }- termed the 'Burning: 



Scale.' 



3 3 seen. 



, n C Locally the ' Cement ' and 

 iU I 'Black Scale.' 



3 10 



11 



0^ 





a C Volsella minima (Moore 

 non Sow.). 



CPleuromya crowcom- 



I beia auctt., -common 

 7 •{ in the lower portion ; 



I Plicattila hettangiensis 



t_ Terquem. 

 o ( [Often indurated at the 

 6 I Cement Works.] 



3 These beds are frequently 



I conjoined to form one 



2 I* stratum, 8 inches thick. 



HJ [1 to 3 inches.] 



3 



Q. J. G. S. No. 265. 



