MIDDLE CHALK—SUSSEX. 
401 
Different parts of the Middle Chalk are exposed in the following 
quarries near Lewes : — 
1. A quarry west of Glyndebourn, giving a clear section from 
the Melbourn Eock up into the Terebratulina zone. 
m 
2. An old quarry further west, which shows part of the 
Terebratulina zone. 
3. Mount Caburn quarry ; a large quarry, which, with its 
entrance roadway, exposes nearly the whole of the Middle 
Chalk, the beds dipping north. 
4. Southerham limekilns, where portions of three zones are 
exposed, but not a continuous section; beds dipping 
north. 
5. The new quarry at Mailing, opened in the Terebratulina 
zone and that of Holaster planus; beds dipping south, 
6. Bridge wick pit, east of the last; the lower part of this is 
obscured by talus, but the face above shows portions of 
the same two zones. 
7. The first cutting on the railway north of Lewes, traversing 
parts of the zones of Rhynchonella Guvieri and Tere¬ 
bratulina. 
Of these exposures, the first, third, and fifth present the best 
sections of the lower zones, and of these we shall give some par 
ticulars, as well as of the fourth and fifth. 
The section in Glyndebourn Pit, three furlongs west of Glynde¬ 
bourn Farm, from notes supplied by Mr. Eeid and Mr. Ehodes, 
is as follows : — 
feet. 
5. White chalk without flints, inaccessible, but showing two 
thin layers of marl - - 30-40 
4. Nodular chalk with some green-coated nodules 1 
3. White chalk with grey streaks ------ 20 
2. Firm white chalk with a marked nodular bed at the top 
containing green-coated lumps ----- 30 
1. Hard rocky chalk—Melbourn Kock - - - - - ? 10 
About 90 
From the Bed No. 2 Mr. Ehodes obtained the following fossils, 
which were named by Messrs. 
Discoidea subuculus. 
Galerites subrotundus 
Terebratula semiglobosa. 
Rhynchonella Cuvieri. 
Inoceramus mytiloides 
Sharman and Newton : — 
Inoceramus like Lamarck i. 
Spondylus sp. 
Ammonites [Hoplites] leptophyllus 1 
„ [ Acanth.] nodosoides. 
From the overlying chalk (No. 3) he obtained Terebratula 
semiglobosa , Terebratulina gracilis var. lata, and Inoceramus sp. 
Mount Caburn Quarry.—This was described in some detail by 
Dr. Barrois in 1876 (“ Eecherclies,” p. 28), and it was visited by 
Mr. Ehodes in 1896, by which time it would seem to have been 
enlarged and cut back further than when seen by Dr. Barrois. 
