80 



PURBECK AND 



gYlleet Downs Vein of the midd1 ^ Purbeck : about 2 feet above the 



Wall-case 43. 



cinder bed. — Durlston Ben/, Sivanaae* Do 



(s 



sheet 22.) 



Geological Map, No. 16, and Vertical Sections 



78. 



Pi 



Peverel Point Do 



from the marble-rag beds ofth 



This bed contains much green matter, and its surface is 



Uj 



)$ 



79. — Purbeck limestone, compact bituminous lime- 

 stone. " Pink bed," forming a part of the freestone series 



of the middle Purbeck. 



Quarries, Do 



80. — Purbeck limestone, hard compact bihiminous 

 limestone. (" Roach bed," occurring in the freestone beds of 

 the middle Purbeck.) The surface of the specimen is covered 



D 



$ 



Q 



near 



81. 



F< 



Forest marble, sandy 



fi 



82. — Purbeck limestone, thin bedded shelly lime- 

 stone, of brackish-water formation, with numerous valves 

 of Cyclas or Cyrena. — Limekiln Quarry, near Kingston, 

 Dorset. 



83. — Purbeck limestone, compact freshwater lime- 

 stone, occurring in thin bands in the upper cypris shales of 

 the middle Purbeck beds, and containing numerous Cyclas, 

 or Cyrena, Paludina carinifera, Cypris. Peverel Point, 

 S manage, Dorset. 



84. — Purbeck limestone, bituminous limestone, from 



Swanage 



the "freestone bed* of the middle Purbeck. 



Quarries, Dorset. 

 85. — Purbeck limestone, shelly fresh 



with numerous Cyclas or Cyrena. — Swanage Q 



D 



Ve 



This bed, which occurs in the " Laning " or " Leaning 

 n " of the middle Purbeck series, is called in the Isle 



of Purbeck " Laper," and is quarried for paving stones 



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This bed 



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