403 
I 
MIDDLE CHALK—SUSSEX. 
3. Amberley, Houghton, and Duncton. 
Tlie only other district about which we have any special informa¬ 
tion is that which includes the villages of Amberley, Houghton. 
Bury, Bignor, Upper Waltham, and Duncton. The exposures in 
this district have been examined by Mr. C. Reid and Mr. W. Hill. 
Zone of Rhynchonella Cuvieri. 
Rough nodular chalk which cannot be far above the Melbourn 
Rock is exposed in the most northern part of the large quarry by 
Amberley Station, close to the main road. About 25 or 30 feet 
of this chalk is seen, and from it Mr. Hill obtained Inoceramus myti- 
l aides and a few Rhynchonella Cuvieri. 
The base of the Melbourn Rock is exposed in the quarry south 
of Bury, and Mr. Reid saw good sections of the lower half of the 
Middle Chalk in the road cuttings south of Bignor and near Cold- 
harbour Farm. He could trace the outcrop of the Melbourn Rock 
continuously along the escarpment from Sutton to Duncton. A 
pit by the road, a little below the top of Duncton Hill, about 700 
yards south-west of the church, exposes the zone of Rhynchonella 
Cuvieri, that fossil and Inoceramus mytiloides being abundant. 
Mr. Reid’s survey also showed that a westerty extension of the 
Creenhurst anticline causes the Middle Chalk to be exposed con¬ 
tinuously from Farm Hill and Upper Waltham along the La van t 
valley as far as West Dean. The Melbourn Rock is exposed at 
several points round the inker of Lower Chalk at Littleham Farm. 
Terebratulina Zone. 
The best section of this zone in western Sussex is that of the large 
quarry by Amberley Station. 
Writing of this quarry in 1850, Mr. Dixon said,*' “the large 
quarry on the opposite side of the River Arun (to Houghton) is 
called Balcombe-pit, and is of the Lower Chalk formation, or that 
without flints.” Among fossils found here he mentions Radiolites, 
“ bones of Turtles and Fishes in very good preservation, particu¬ 
larly Beryx ornatus and Macropoma Mantelli, Echinoderms and 
Crustaceans, especially Enoploclytia Leachi. The nodules of 
sulphide of iron here often contain a Terebratula or other small 
shell in the centre, which elsewhere is rare.” 
Professor Barrois has also described this pit (Recherches, p. 33) 
giving the following particulars : — feet. 
5. Compact chalk with scattered flints. 
4. Shaly chalk with scattered grey flints, Terebratula semi- 
globosa, Inoceramus sp. ----- 6^ 
3. Layer of yellowish nodules. 
2. Homogeneous white chalk, in courses separated by seams 
of grey marl ------- 82 
1. Hard compact white chalk, in beds about 3 feet thick, 
separated by marly seams, which contain nodules (of 
chalk) ---------- 33 
About 121 
* Geology of Sussex, Second Edition, 1878, p. 130. 
4219. D D 
