206 
THE GEOLOGIST. 
" The Tertiaries of Bigorre consist entirely, in the valley we have 
named, of a lacustrine deposit, formed at the foot of the Pyrenees 
after the last rising of the land ; and do not offer at any point the 
smallest indication of an upheaving force. 
" This deposit in the first instance formed a table-land extending 
from the foot of the mountains ; but this has since been divided by 
the diluvium streams into strips, as it were, now found separated by 
the valley of the Adour, and numerous dales. 
" In the region which occupies us in the present paper, the tertiaries 
follow the bend of the hill between Bagneres and Louides, and an 
outlying prominence, whose elevation was too great for the tertiary 
waters to cover. 
" For this reason, on either side of this hill, we see the tertiaries 
commence by two beds which cover and level the cretaceous schists 
and overlying beds, pierced and diversified by granite and ophites, 
which never, however, reach the surface. 
" One of these beds begins at Bagneres, but only on the right side 
of the Adour, whence it extends to the east to join itself to the plain 
of Launemezan. 
" The other commences not far from Lourdes, to the left of the 
valley of Ade. They leave between them the hill above mentioned, 
which is entirely uncovered by these deposits. 
"A little to the north of Montgaillard (Vieille Ossun), near the 
plain of Tarles, one sees the outliers of the Pyrenees represented by 
the conglomerate of Palasson, dip under the tertiaries in such a manner 
that from this limit all the hills in the valley ai'e composed of it." 
PROCEEDINGS OF GEOLOGICAL SOCIETIES. 
Geological Society of London, — March 6, 1861. 
1. " On the Successiou of Beds in the Hastings Sand in the IN'ortliem 
portion of the Wealden Ai-ea." By F. Drew, Esq., F.G.S., of the Geological 
Survey of Great Britain, 
Havmg first referred to the division of the "Wealden beds by former authors 
into the "Weald Clay," the "Hastings Sand," and the "Ashburnham Beds," 
and the subdivision of the "Hastings Sand" by Dr. Mantell into "Horsted 
Sands," "Tilgate Beds," and "Worth Sands," and having defined the district 
under notice as lying between and in the neighbourhood of the towns of Ten- 
terden, Cranbrook, Tunbridge, Tunbridge Wells, East Grinstead, and Horsham. 
Mr. Drew proceeded to describe, first, the several beds in the meridian and 
vicinity of Tunbridge WeUs. The Weald Clay is at least six hundred feet 
thick in this district, and is underlaid by sands and sandstones, termed by the 
author the " Tunbridge Wells Sand," "^on account of its being well exposed 
there. This subdivision is about one hundi-ed and eighty feet thick, and was 
described in detail ; an important feature being the " rock sand," or massive 
sandstone forming the picturesque natural rocks of that neighbourhood. The 
