28 



MK. L. BICHAEDSON ON THE KH^TIC OF [Feb. I9II, 



% 



Section at Lilstock. 



Thickness in feet inches. 



i\ L 



« 2. 



H < 



w 



H 



H 



^ 3. 



C Limestone, hard, blue-centred; very "> , 



(_ conspicuous ) 



Claj r , brown, shaly 



Limestone: 2 to 7 inches 



Shale 



Limestone, shaly 



Shale and clay, brown and grey ... 1 



Limestone, blue- centred 



Shale and clay, brown 



Limestone, very massive, dark grey 1 

 C Shales, hard, brown, passing down ") ~ 

 ( into ) 



C Limestone, rather shaly in places, > „ 

 \ but usually a well-marked bed ... ) 



C Shales, yellowish-brown and grej r , ") 



f I not so thinly laminated > 3 



f Limestone, often not a very con-^ 

 J spicuous bed, as it passes into a 

 yellowish rubbly deposit, but is fO 

 always present in one form or the | 



other J 



^ ( Shales, papery, hard, thinly lami- ) , 

 £ nated, brown and grey- speckled... ) 

 C Shales, earthy, yellowish, with ai 

 ■< thin blue zone at the centre and > 

 (. a few gritty seams J 



10. 



11. 



}• 



^0 



("Sun-Bed. Li mestone, brownish- 



(. grey, yellow exterior 



fShale-parting, brownish yellow. 

 Nodular masses of a grey-brown 

 limestone are often present here, 

 making, with the bands above 

 and below, three beds with marl- 

 partings. Often the top lime- 

 stone becomes nodular, and com- 

 bines with the middle layer : 



to 4 inches _ 



TLimestone, bluish-grey, very hard,^ 

 I yellowish exterior ; contains | 

 <( pebbles of a hard compact lime- }>0 

 I stone as at Pinhay Bay, near | 



1^ Lyme Regis J 



fMarl and hard brownish blue-^ 



< centred rubbly limestone ; 8 ! 



(. inches ! , 



C Very pale yellowish-green and [ 



< rather sandy-looking beds ; strati- j 



t tied: lfoot J 



C Limestone, hard, dark blue, shelly, ~) 



\ forming a conspicuous bed. and a f ^ 

 1 useful datum-level ; ferruginous : t 



C 3 to 7 inches ) 



Shale, yellowish 



C Limestone in nodular masses,") 

 ) brownish-grey, weathering pale f n 

 1 yellow. (See p. 27.) to 18 t u 

 V. inches J 



1 Ostrea 



2 

 5 



H 



H 



3 

 5 



3 



2 



Strickland. 



='the Clogs' at Dun- 

 ball. 



Volsella minima (Sow.). 

 = 'Lias Paviours' of 

 Dunball. 

 =' Bottom Lias' of 



[Dunball. 



Paper-Shales. 



seen. 



Volsella sp. (crushed). 



n ( Ostrea liassica, common 

 \ in the blue zone. 



10 



2 1 



f Very variable beds : 1 & 

 I 3 should be found first, 

 and then the inter- 

 vening portion can be 

 made out. Ostrea lias- 

 sica. 



f Dimyodon intus-striatus 

 I (Emmerich), Volsella 

 ■\ minima (Moore non 

 i Sow.), Plagiostoma va- 

 [_ loniense (Def ranee). 



Rubbly Beds.' Fossils 

 of Bed 3 ; and, in addi- 

 tion, Protoco.rdia rhce- 

 tica (Merian). 



3 11 



