CHALK. 87 



described by M. Barrois in 1875.* He obtained from it Inoce- 

 ramus labiatus, Rhynchonella Cuvieri, and Cidaris hirudo. 



The Chalk Marl appears on the east side of the Gatcombe road, 

 and in an old pit midway between the two described above. On 

 the east side o£ the valley a large pit exposes the Lower Chalk ; 

 the Middle and Upper Chalk are seen, but not well, in the side 

 of the road. 



Some fine sections occur at the east end of Arreton Down. On 

 the west side of the high road, in the bottom of a disused pit, 

 Mr. Whitaker found the Chalk Rock. It is now overgrown, but 

 the beds above it are seen as follows : — 



Ft. In. 



Nodulai" chalk with a few grey flints. 



Smooth chalk with Terebratula semiglobosa, Inoceramus, &c. 2 6 



Rough nodular chalk - - - - .60+ 



Fifty yards east of this pit, and on the opposite side o£ the road* 

 a marl-pit exposes a good view of the Chalk Rock, the section 

 being as below : — 



Ft. In. 



f Smooth chalk _ . - 



I Black clay - - - . 



Upper Chalk <^ Rough chalk - - . - 



I Chalk J Line of green-coated nodules 

 [ Rock 1, Rough nodular chalk 

 I Smooth chalk . _ _ 



I Marl .... 



I Smooth chalk . . . 



Middle Chalk<; Marl .... 



Smooth chalk _ . . 



Marl - . . - 



Smooth chalk , _ « 



Following the foot of the Down eastwards we fin d a large pit 

 300 yards north-west of Heasley Lodge, in the upper part of 

 which a band of rough chalk, nodular in parts, is no doubt the 

 Melbourn Rock. The section is as follows : — 



I^it on Mersle.y Down. 



Massive chalk with marly partings - 

 f Nodular chalk, the top concealed, seen up t o 

 Melbourn J Thin-bedded chalk with partings of greenish 

 Rock. I marl . - - - - 



iHard chalk, nodular at the base 

 Alternations of chalk and marl 

 ? Belemnitella f Laminated marl - - - - 



Marl. 1. Marly chalk with curving joints 



The pit is worked deep into the Chalk Marl, but the rest of 

 the section is obscured by talus. There is a large pit in the same 

 beds by the side of the Ryde and Newchurch road, but the 

 Melbourn Rock was not to be found. The *Chalk Marl is well 

 seen in a large pit north of Kern. 



* Craie de I'lle de Wight, p. 16. 



