ged forests which have bee
i part of the external surfs
:lepth (250 feet) as to lead
Woodward in his ‘ Geolc
nges that have taken place
Forest-bed, and Mr. Lydek]
however giving an indicati
‘ c. A period of less severe climatic
and cavern deposits were laid down, and
mIH m t«»mnerate and penial : Arctic and South«
were the more
‘ 6. A period of severe Glacial
affecting Scotland anicl the north of
• ‘ 7. Period of the retreat o f the i<
and Britain was protiably isolated.
*8, Britain again1 continental; :
ritain and Ireland
discovered near Anglesea,, Lancashire,
in Norfolk. Ex<ovations and
ancient valleys and rive:r-beds which
of our istands prior to th:is subsidence,
ologists: to the conclusie>n that at no
connecteid with France, (
* makes clear
. Britaii he deposition
1 thus :arranges them in chronological
he probable duration of these
i, and iiidications of appi*oaching cold.
t Boule1er Clay (an ice formation) of
of land1, accompanied by severe Glacial
ng which Marine sands and gravels
rly to the summit of Moel Tryfaen;
Dr. Wallace’s great period of subwhich
a large portion of Britain was
; of the Boulder Clay was deposited;
imals with which it is now populated,
is, during which the brick earth
te gradually changed from intense
1 animals visiting Britain, accord-
> the one or the other,
th glaciers and coast-ice, chiefly
mountain glaciers' alone remained,
inter temperatures more excessive