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MR. .T. W. D. ROBINSON OX 



[vol. lxxvi,. 



being recorded. The latter is a tough, compact, fine-grained rock ; 

 but the others are rubbly, sometimes being only loose sand. They 

 are practically unfossilit'erous ; the black type, however, is full of 

 white markings resembling worm-casts, and I have found one coral 

 in the upper yellow bed. 



The marls at the top are extremely fossiliferous. especially so 

 immediately under the Ferques Limestone. 



There are a number of small exposures of these deposits near 

 Beaulieu Abbey, mainly in ditches. Elsewhere they are very rare,. 

 so far as the shales are concerned ; but the dolomites can be traced 

 across country as bare, dry, rocky hillocks. 



Ferques Limestone. — This is a grey or blue-black massive- 

 limestone, very extensivehy quarried right across its outcrop from 

 Fiennes Chateau to La Capelle. Corals and brachiopoda are- 

 abundant in the lower beds, and the upper beds which gradually 

 become shaly and sandj^ are fossiliferous also ; the massive middle 

 beds too contain fossils, but they weather out less readily. 



The middle beds have been most worked, owing to their greater 

 thickness, the lowest being thinly stratified and the highest soft 

 and shaly. Working has frequently ceased on a dip-fault being 

 reached, owing to the clay and rubble in the fault-rock ; in some 

 cases the fault-rock is left standing as a wall. The thickness is- 

 201 feet. 



The following fossils are recorded by lligaux ('Notice Greo- 

 logique sur le Bas-Boulonnais ' 1892, p. 13) : — 



Phorus bouchardi. 

 Natica spp. 



Machrocheilus schlotheimi. 

 Murchisonia bilineata. 

 Loxonema h ennahiana. 

 Stvaparolltos. 

 Turbo. 

 Dentalium. 



Belleroplion tessellatus. 

 Aviculopecten neptuni. 

 Limanomya grayiana. 

 L. multicostata. 

 Athyris concentrica. 

 A. concentrica, var. 

 Atrypa reticularis. 

 A. longispina. 

 Spirifer bouchardi. 

 S. verneuili. 



Rhynchonella ferquensis. 

 Streptorhynchus devonicus. 

 Orthis striatula. 

 Beptsena dutertri. 

 Strophomena latissima. 

 Chonetes armata. 

 StrojAalosia productoides. 

 Productus subaculeatus. 

 Acervidaria davidsoni. 

 Cyathophyllum bouchardi. 

 C. profundum. 

 Favosites dubia. 

 Thecostegites bouchardi. 

 Smithia boloniensis. 

 Alveolites subsequalis. 

 Ghsetetes goldfussi. 

 Metriophyllum. 

 Betepora antiqua. 



Fiennes Shales. — Immediately above the limestones, and 

 grading into them, appear fine-grained greyish-chocolate shales. 

 They are well seen at the Beaulieu brickworks and in Beaulieu 

 Wood ; elsewhere they may be traced by the colour of the soil and 

 the tendency to form bogs and ponds. Fossils are rare ; but the- 

 following are recorded by Rigaux : — 



Leptsena latissima. 

 Chonetes armata. 



Spirifer verneuili. 

 Camarotwchia ferquensis. 



The thickness of these beds is 324 feet. 



