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CHALK MARL, AND CHALK. 



83 



95. 



Eocene (fresh 



limestone. — Headon Hill, Isle of Wight. 



In consequence of its great development at Bembridge 

 and Sconce Point, this limestone has been termed Bem- 

 bridge or Sconce limestone ; it is also known by the name 

 of the Bulimus limestone, from the frequent occurrence 



Tpper 

 Gallery. 



Wall-case 43 



at shell, {Bulimus ellip 

 Memoir on Isle of Wi 



(See Map 



Pt 



) This specimen contains the 



96. — Chalk maul with fossils, forming the base of the 



chalk. 



of Brixton, Isle of Wigh 



It is burned for lime, and used for agricultural pur- 



poses. 



97. — Purbeck limestone, earthy freshwater limestone, 

 from the Insect marls of the lower Purbeck. — North-east of 

 Oakley Quarry {in a wood), near Tisbury, Wilts. Map 15. 



These marls contain comminuted fragments of plants in 

 a carbonised state, and the wings and other remains of 



insects. In the Vale of Wardour, these beds are much less 

 developed than in the Isle of Purbeck. 



98. — Portland limestone, earthy limestone. — Oakley 

 Quarry, Tishury, Wilts. Map 15. 



In the Vale of Wardour, the upper beds of Portland 

 stone, which overlie the oolitic freestone, Nos. 52 and 53, 

 assume the character and appearance of ordinary Chalk, 

 with irregularly disseminated flints. They contain numerous 

 and perfect specimens of Trigonia, Oyster, Cardium, &c, 

 and are burned for lime. — H.W.B. 



99. — Chalk, earthy limestone, with flints, from the 



middle chalk. This specimen gives an idea of the manner 



in which flints lie bedded in chalk. — Arreton Down, Isle of 

 Wight. 



100. — Chalk, earthy limestone. This chalk furnishes 

 an excellent manure. — Moncton, near Cranborne, Dorset. 



101. — Chalk, earthy limestone. — Moncton, near Cran- 

 borne, Dorset. 



