1871.] 



JTTDD PITNFIELD FORMATION. 



213 



Fig. 2. Section of the Punfield Formation, 



N. side of Swanage Bay. 



Scale 1 in. to 20 ft. 



"Lower Greensand" (Upper Neo- 

 comian). 



-" -'-' ' \ passing into thick-, irregularly 



, - 1£-J^-1^ \ bedded ironstones. 



G-rey cypridiferous shales, with 

 bands of limestone, ( Cyrena, Oys- 

 ters, &o.), "beef." 



■^^==' Cream-coloured and yellow sands 





s^=^ Wliitish and carbonaceous clays. 



Ash-coloui-ed and yellow sands, 

 ?4^ with thin irregular wavy seams 

 of light and dark blue clay, and 

 bands and patches of imperfect 



^ brown ironstone. 



Marine band. 



Variegated beds of the Wealden, 



Ash-coloured and yellow sands, with 

 seama and bands of ironstone 

 (Oyster-beds). 



Grrey and ash-coloui'ed sandy clay, S 

 with bands of ironstone. i-t 



02 



pq 



Bright yellow sands passing into N 



ironstone. ^ 



O 



Ash-coloured and yellow sands, 

 with thin irregular wavy seams of 

 light and dark-blue clay, and 

 bauds and patches of lignite and 

 imperfect brown ironstone. 



Fig. 3. Section of the Punfield Formation 



in the Isle of Wight. 



Scale 1 in. to 20 ft. 



" Perna-beds " (Upper Neocomian). 



(Jreen clays. 



Dark grey finely-laminated shales 

 in places abounding with Cypris. 



Bands of bmestone with " beef" and 

 " cinder," Cyrena and Ostrea abun- 

 dant. 



Dark grey shales with a few bands 

 of sandstone, Cypris and Paludina. 



Limestones with Ostrea, Modiola, 

 Cardium, and other marine shells. 



Dark-coloured shales and marls, 

 cypridiferous in places. 



" Bone-band," shales, and thin 

 bands of limestone ( Cyrena). 



Grey paper-shales with sandy and 

 limestone bands. 



Some bands of lignite and nodules 

 of pyrites. 



Beds of yellow sand, very irregular 

 and inconstant. 



Dark grey and black shales, with 

 bands of shell limestone. 



Oyster-beds, sandy and septariiform 

 layers. 



Irregular and inconstant beds of 

 yellow sand. 



Dark gre)' shales, with bands of 

 limestone, &c. 



Bed of hard ferruginous sandstone 

 with pyrites, Ostrea, Cyrena, &c. 



False-bedded yellow sands and 

 sand-rock, very ferruginous in 

 places. 



Alternations of finely laminated 

 clay and sand, with some seams 

 and patches of lignite. 



Tariegated beds of the Wealden. 



