52 
many miles. The Plantagenet beds near Albany rise to a height of 
170 to 200 feet or more al)ove sea-level, but their maximum thick- 
ness is not known. The depth of the I^lantagenet Sea has not been 
determined, but as the present hills and ridges of granite rise high 
aljove the existing plain of marine sedimentation— and were thus 
not submerged — and the organisms contained in the strata do not 
appear to be of very dccp-waler origin, the depth of the sea was 
probalily not more than a few hundred feet. The summits of the 
old granite hills and ridges would thus at that time have formed 
a grou]) of islands and islets, at no great distance from the coast, 
being in this res])ect a close counter-part to the present Recherche 
Archipelago, some distance to the east of Albany. There is also 
no evidence at i)resent available to <letermine the height of the old 
land surface i)rior to submergence. 
The secoml displacement was a negative one, the old sea-bed 
in the neighbourhood of Albany attaining a height of more than 
200 feet above sea-level. 'I’his fact is indicated by the present 
height of the i)lain of marine sedimentation, which however, docs 
not measure more than a minimum amount of disi)lacement, as a 
])ositive movement has since taken i)Iace. Hetween the time of 
the latter and the negative displacement, the land must have 
occui)ied a much greater area than at jiresent. Judging l)y the 
channels forming the various entrances to King George’s Sound, 
the land probably extended at least as far cast and south as these 
entrances, and perhaps also considerably to the south of the present 
ocean coast line west of P*ald Head. 
The third dis])lacement was the i)ositive movement just re- 
ferred to. which resulted in the drowning of the lower end of 
the old Kii:g-Kalgan River, and the formation of Oyster and 
Princess Royal Harbours and King George’s Sound (the latter 
two ])ossibly however, forming at first portion of a strait extending 
to the prcsein 'I’orljay Inlet). These points \\ill be later discussed 
and the evidence stated to show that on this dis])]acement. the sea 
covered somewhat more land than at i)resent. To the north of 
Alba’iv the depth of the sea caused by this nuwement might only 
have been a comi)arat ively few feet (as the partially drowned 
valleys of the imcsent King and Kalgan Rivers have not very deeiJ 
water), but if the obi land extended eastward from Limestone 
Head, in the latter locality, assuming no change in depth has since 
taken place, it would be nume than IftO feet, as the sea there is 
now a greater depth than this. It is quite possible that the *b) 
fathom liiic was about the boundary of the old land. 
There may have been a later negative mo\ ement, but the 
writers are not aware of any definite evidence as to this, although 
it has been noticed in many ])arts of the Australian coast. If how- 
ever. it is taking ])lace. it will hasten the reclamation of the land. 
