26 



PROCEPIDINGS OF THE GEOLOGICAL SOCIETY. [NoV. 9, 



tertiaries nearest the surface became elevated with their gravel cover- 

 ing, and cut back by the denudation into the form of scarped brows. 

 While, however, the high brows of the "Hampshire gravel are 

 thus, I contend, coeval, or nearly so, with the high-brow gravel of 

 the Thames, East-Essex, and Canterbury sheets, the lower-terrace 

 beds of the Thames gravel formation are not, I venture to suggest, 

 coeval with the Elephant-gravels of Mr. Codrington, but are con- 



Eig. 2. — Theoretical Section connecting the Thames and Hampshire 

 Gravel Brows. 



Mr. Codrington's inlet. 



The western extremity of the Weald. 



1. Weald clay. 2. Lowei'Greensancl. 3. Graiilt, Malm Eock, and Upper Green- 

 sand. 4. Chalk. 5. The Lower Tertiaries. a. The sea-bottom on which 

 the high-brow gravel of the Thames and Hampshire sheets accmnulated. 

 b. The sea-level of ihai period, c. The sea-bottom of the inlet wherein the 

 lower Hampslnre marine gravels accumulated, d. The sea-level of that 

 period. The XXX mark the high brows of gravel of the London and 

 Hampshire areas, f The part over which the sharply broken flint accumu- 

 lations of Sir E.. I. Murchison occur. f indicates the foci of preglacial 

 upheaval. # indicates those of postglacial upheaval. (N.B. The Needle 

 Down should in the upper representation have been drawn free of Tertiaries 

 and near the sea surface.) 



siderably anterior to them, and possess a well-known older and 

 somewhat different fauna, both mammalian and molluscan, though 

 of course posterior to the highest-brow gravels of either area. In 

 other words, the great slope of gravel which Mr. Codrington shows 

 as stretching from low levels (where it inosculates with the Elephant- 

 gravels of the vaUeys) up to brows where it is cut off by denudation 

 at elevations of 400 feet, represents, according to my view,',that long 

 postglacial period during which, over Surrey, Sussex, and Kent, those 

 extensive changes of land and water were proceeding which resulted 

 in the denudation of the Weald — the SeLsey deposit (which I have 

 correlated with the retirement of the sea within the Wealden escarp- 

 ment) being covered by the lowest-level portion of the Hampshire 

 sheet. 



Disctrssioir. 



Mr. Godwin- AtrsTEN thought that the author had done his theory 

 injustice in presenting only a portion of the Wealden area for con- 

 sideration. He remarked that phenomena similar to those of the 

 Weald were to be found in various parts of Western Europe. He 

 was glad to find that Mr. Searles Wood did not regard the escarp- 



