Vol. 67.] 



WEST, MID, A1ST1) EAST SOMERSET. 



35 



[DUNBALL.] 



Thickness in feet inches. 



16 A ( 2 ) 



17.- 





25 



C Thin sandstone-layers, grey, mica- 

 l ceous 



(1) Shales, black, thinly laminated 

 Shale, extremely selenitic, ferru 



ginous, simulating a hard band 

 /„\ ( Shales, black, thinly laminated 



(. gypseous aggregations 



/-.x ( Limestone, dark grey, impure, 

 *• ' (. arenaceous : 2 to 4 inches 



(2) Shale and thin sandstone-layers ... 

 r Limestone, hard, dark grey, arena- 



/o\j naceous, 'with argillaceous con- 

 *■ ' 1 cretions of pyrites in lower part ' 



C (Etheridge) 



C Shales, black, laminated, with"^ 

 j several thin, grey, tine-grained, f , 

 I micaceous sandstone-layers near t 



L the top. Selenite J 



( Sandstone, pale grey, non-calca- 7 ,-> 



\ reous, dense, fine-grained ) 



Shales, black, laminated about 3 



C Sandstone-layers, greenish-brown,") 

 3 micaceous, ferruginous, earthy, f , 

 1 mixed with a preponderant amount t 

 C of shale J 



3 Fish-scales. [1 to 3 inches.] 



Tteria contorta, Proto- 

 cardia rhcetica. 



32 2 





fa 



O 



Dull yellowish-green earthy sand- ") q 

 stone, slightly ferruginous ) 



^- ? Non-sequence. 



Marl, sandy, greenish-yellow 



Marl, hard, greyish-yellow 



Marl, less compact, darker yellow . 

 Marl, yellowish-green, argillaceous, ") , 



rubbly ) 



Marls, dirty yellow, dark green, 7 „ 



and black ) 



Hard marl 



Marls, dirty yellow, indurated in \ 



places ) 



10 



Pteria contorta (teste 

 Etheridge). 



10 



Comparing this section with that already described at Lilstock, 

 we shall first of all notice that the Sully Beds have become greatly 

 reduced in thickness, and that at Dunball a 10-inch bed below the 

 Black Shales is tentatively regarded as representing their upper- 

 most portion. The thickness of trie Westbury Beds at both places 

 is about the same. Bed 9 is an easily found limestone, and at 

 Charlton Mackrell was noted at about 15 feet above the base of the 

 Black Shales. 



At Dunball the principal bone-bed appears to occur at a higher 

 horizon than usual, being the bed numbered 9 ; while the bed that 

 is presumably on the horizon of the main Bone-Bed (that is, 15) 

 contains but few vertebrate-remains. The Cotham Beds at Dunball 

 and Lilstock agree very well, and so do the Langport Beds ; but the 

 Watchet Beds are not typically developed, and some care has to be 

 exercised in separating them from the Paper-Shales when the dividing 

 limestone is not distinctively developed. 



Close to Dunball Station are the Cement & Lime Works. As 



d2 



