69 
such boreal forms as Pecten islanclicus, Lima excavata , 
Saxicava Norvegica and others in the Sicilian Upper Tertiaries : 
and the deep sea dredgings in the Bay of Biscay, and off the 
South of Ireland, offer conclusive evidence of areas still 
existing in which the faunas of the north and south co-exist. 
Such a line of communication would cross France between 
Bordeaux and Narbonne, the Selsey Sea being separated 
from it by the as yet unbroken land westward. 
The large erratic blocks of stone scattered along the shore 
are often of considerable size (one now hidden in the advanced 
shingle near Pagham on the opposite side of the Selsey 
Peninsula measuring 28 feet round) and of great interest, and 
including a siliceous breccia, crystalline limestones, grey and 
red granites, syenites, slates, mica schist, conglomerates and 
other rocks whose place of origin has not been definitely 
recognised; and in various instances this seemed to indicate to 
Mr. Goodwin-Austen that they had been derived from rocks 
formerly occupying the bed of the English Channel. 
After a long and careful examination of the surroundings, I 
am unable to accept Mr. Goodwin-Austen’s view that the 
association of these rocks with the yellow clay mentioned in 
the earlier part of this paper is otherwise than accidental, as 
they occur in many places where the clay is absent, and the 
view I have been inclined to adopt is that they were not 
deposited till a much later date, and that they mean a 
difference of 20 degrees of latitude between the temperature 
prevailing at the time of the formation of the mud deposit, 
and that equal to the production of ice sufficiently strong to 
bear their weight, and the distance and direction from 
which they must have come sufficiently testify that wide and 
spreading changes had taken place before such movement 
became practicable. 
Of the deposits that were presumably laid down during this 
interval there is no trace either at Selsey or eastwards, but the 
whole of the foregoing deposits show great denudation and 
erosion. 
The Selsey fauna may be collated with the insects of the 
Lexden peat described by the Rev. 0. Fisher which are 
altogether of trans-Pyrenean types, and, like the Selsey 
organisms, indicate a much warmer climate than now prevails. 
