xv. SECTIONS NEAR AYLESBURY. 419 



limestones, with cyprides, which yielded remains of fishes and 

 turtles. 



Dr. Fitton was fortunate in finding in the pit at Bishopstone 

 the following interesting succession : 



ft. in. ft. In. 



1. Soil. 



2. Fuller's-earth, greenish and brown . . . . o i to i o 



Iridescent Mytili in this bed. 



3. Rubble, white fresh-water limestone, decomposed, containing 



Cypris and casts of small Paludinse in calcareous spur . . 4 o 



4. Clay and stone : 



a. Light olive-greenish fuller's-earth . . . . . .04 



&. Soft limestone 06 



c. Fuller's-earth like o. 02 



d. Stone like 6 o 3 



e. Fuller's-earth 02 



i 5 



5. 'Sandstone' a firm calciferous grit, with traces of deposition 



surfaces and ripple-mark o 6 to o 9 



6. Sand alternating with ochre and clay : 



a. Sandy ochreous clay 02 



6. Dark greenish fuller's-earth 02 



c. Greenish-grey sand, including scales of fishes . . . .07 



o ii 



7. Fissile calciferous clay or marl, passing into stone. In the upper - 



part iridescent Mytili. 



a. Dark bluish clay with Cypris, Unio, and scales of Lepidotus. 



b. Clay, hard, with Cypris. 



c. Clay, still harder, approaching to stone, with Cypris. 



All these divisions contain Cypris Valdensis, and another species 

 a small smooth Modiola, a striated species ; and Cyclas parva. 



8. 'Pendle,' fissile argillaceous limestone, with Cypris, Cyclas, Modiola, 



Paludina, etc., as in the 'malm' at Garsington. Sometimes a de- 

 pressed Planorbis as at Garsington 06 



(Portland rock below.) 



Close to Hartwell I observed an excavation shewing 



ft. in. 



' Bubble,' white marly limestone of varied structure, with few fossils 4 6 

 Three thin greenish marly layers, with two courses of pale stone . i 3 



Brown, blue, and ferruginous layers (Natica) i 6 



Marly layers 08 



'Pendle' stone . . .010 



Marly layers, with insects, fishes, and parts of a turtle . . .010 



Hard blue stone 12 



Dark laminated band. 



Under these layers, which appear partly of marine and partly 

 of fresh-water origin, like some in the Isle of Purbeck, are three 



E e 2 



