28 
The zones on the diagram are those recommended by the 
Sub-Committee of the Geological Congress, 1888, for Zone 
No. 9 (Rhynchonella cuvieri) can be more readily recognised by 
Professor Barrois’s zone of Inoceramus labiatus; it is much more 
abundant than the former, and, in small exposures, more readily 
found. The recognition of strata from their fossils was first 
announced in a small volume published by Mr. William Smith, 
Mineral Surveyor, Derby, entitled ‘‘ Strata Identified by 
Organised Fossils.’’ He gives the fossils of the upper chalk, 
and the illustrations occupy half a sheet. JI have placed 
the volume on the table, and, alongside it, the volume of the 
Paleontographical Society, where a single genus (Spondylus) is 
illustrated by sixty-four figures. This exhibits a very large 
increase in our knowledge, but, for field work, the illustrations 
in Smith’s book are much superior,—clear and clean cut lines 
are well drawn. 
Professor Barrois was the first to describe the zones of the 
chalk on the English and Irish coasts. His divisions and zones 
are generally accepted in this country. In England the latest 
and most exhaustive description of the zones of the white chalk 
of the English coasts is by Dr. Rowe, F.G.S., &c.,—diagrams by 
Mr. Sherborn (1900). The first part, Kent and Sussex, 
describes the coast sections from Newhaven to Brighton. To the 
field worker it is an invaluable guide. The accuracy and 
precision of description, and the clearness with which the zones 
are separated and explained, is delightful,—a classic work for the 
coast sections of the white chalk. 
To Dr. Rowe I owe much. He directed me how to 
recognise the zones of the chalk by their fossils, and, for the last 
three years, by a large correspondence, notwithstanding the calls 
of a busy profession, has identified and described my specimens. 
Zone 1.—Belemnitella mucronata is altogether absent in 
Sussex. I exhibit a specimen from Trimingham, Norfolk. 
This zone has only been found in the Counties of Norfolk, 
Hampshire, Wilts, and Dorset. I have searched for it between 
Newhaven and Preston Railway Station, without success, the 
only localities where it is likely to be found. 
Zone 2, Actinocamax (Belemnitella) quadratus.—This zone 
is widely represented on the Brighton coast. It is found on the 
upper part of the cliffs from Newhaven to Saltdean Gap, where 
it comes down to the tide level, then running high in the cliffs 
to Rottingdean, where it again comes down to the shore, then 
runs high in the cliffs to the junction of the chalk with the 
Coombe Rock near Brighton. Inland it is found in road 
cuttings between Newhaven and Rottingdean, and in a small 
roadside quarry at East Hill, three-quarters of a mile north of 
Rottingdean. It is again exposed in Ovingdean quarry and near 
the Golf House in chalk thrown up in digging drains for houses 
