376 SECTIONAL TRANSACTIONS.—C. 
cliff line at 800 ft. against the Prescelly Hills, but farther east, in Carmarthen- 
shire, it is difficult to separate this surface from one rising gradually from 
goo ft. to the mid-Wales platform at 1,500 to 2,000 ft. 
The 600-ft. platform will be discussed in some detail and the drainage 
system, developed on the emerged surface, analysed to show at least two 
erosion cycles graded to progressively lower base-levels. 
A somewhat similar sequence of events is apparent in South Ireland ; 
but here the alternation of rock types of markedly differing resistance has 
brought about an ‘ Appalachian ’ drainage pattern. ‘The erosion surface is 
preserved on most of the interfluve ridges of more resistant rock, and an 
attempt will be made to reconstruct the original form and extent of the 
surface. 
Mr. J. Hanson-Lowe.—Morphological data of the Channel Islands 
and their bearing on the Eustatic Theory. 
The Channel Islands lie well to the south of the southernmost limit of 
Pleistocene glaciation and are free from volcanic and violent seismic action. 
Moreover, these Hercynian stumps consist of rocks sufficiently highly 
resistant to fluvial erosion to warrant the preservation of polycyclic fluvial 
forms. Furthermore, the three main islands are excellently mapped with 
small contour intervals and on large scales. 
These facts suggest that the islands might well throw light on the vexed 
question of ancient higher sea-levels ; and it is of moment that the three 
main islands are sufficiently distant one from the other to permit of com- 
parisons being made between them, each island having been examined 
individually along morphological lines. 
The paper deals with the results obtained mainly from the reconstruction 
of ancient thalwegs, aided by other data afforded by the Clinographic 
Curve, etc. 
Léon (Brittany) is not far distant, and the excellent maps available 
enabled Baulig to deduce certain characteristic levels in this region ; the 
results of the Channel Island investigation are related in the paper to those 
obtained in Léon. 
The accordant data obtained from the maps have been carefully checked 
by personal observation in the field, particularly in Jersey and Guernsey. 
Dr. H. C. Versey.—The Tertiary geological history of E. Yorkshire. 
The occurrence and characters of detached masses of sand on the Yorkshire 
Wolds are described. The peneplane upon which they rest is correlated 
with the peneplanes of Cleveland. 
Excursions to (2) Somerleyton, Kessingland, Covehithe (2.0). 
(6) Corton, Scratby and the Broads (2.30). 
(Both excursions repeated on Tuesday.) 
Tuesday, September 10. 
Prof. Baron G. DE GEER.—Natural annals so far deciphered for 15,000 
years (10.0). 
Our oldest written records, known from cuneiform inscriptions on clay 
slabs, do not go much farther back than 4,000 years. Nature has prepared 
more reliable annals for a longer time, deciphered, so far, for the past 
15,000 years. These annals are preserved in slabs of clay which, by their 
