124 Transactions. 
five raised reef-terraces (Andrews, 1922), and is of especial interest because 
of the recent discovery on it of remains of the giant fresh-water tortoise 
Miolania, now being studied by Dr. C. Anderson. This is also кергек н 
though by a different species, in Lord Howe Island, as will be seen later 
Deprat, and Piroutet) may be replaced by a summary of Piroutet's (1917) 
more recent studies. The island falls into two approximately equal portions, 
the boundary of which is about the line of latitude 21° 15’ south. In each 
the eastern coast is steep, the land “~ into high ranges, while on the 
west the relief is more gentle, and low hills and plains occur. In the 
northern portion the ancient тонет dk gneisses, mica- or glaucophane- 
schists, and less-altered possibly Palaeozoic sericite-schists and quartzites, 
are arranged in an arcuate fold concave towards the north-east, the 
folds striking much more nearly parallel with the general axis 
of the island, though numerous departures from this direction, especially 
two south-westwardly concave arcuate folds, are considered by Piroutet to 
indicate the presence of relatively rigid blocks of ancient folded odis con- 
cealed beneath the younger Mesozoic and Tertiary formations.  Brouwer's 
interpretation of analogous features may be recalled. Some deflections 
also may be due to the entry of the vast instrusive masses of ultrabasic 
rocks. The sedimentary rocks bear witness to continued geographic changes, 
with intermittent folding or warping, erosion and deposition, from Permian 
to Recent times, accounting for the many lacunae in the stratigraphical 
succession. A Permian transgression passed westward over this region, 
depositing littoral and rather deeper- -water sediments. A regression com- 
preceded by basaltic eruptions. Depression followed irregularly in Upper 
Triassic times with a widespread transgression of the sea, followed by a 
complete retreat of the sea at the close of the period, the region being dry 
land during the Rhaetic and the greater part of the Jurassic period. These 
renewed movements were accompanied by further basaltic ар In 
late Jurassic times a further subsidence took place, when the sea flowed 
in from the south-west to the centre of the island, depositing “Tithonian 
and early Cretaceous a эг latter interstratified with rhyolites and 
andesites. Before this, howe r, a certain amount of crust-folding or 
deam 1923); but he nevertheless shows that some crust-folding occurred 
during the middle part of this period, the intensity of which does not appear 
to have been very great. The direction of the fold-axes is stated to be 
oblique to the strike of the Jurassic and the Permian folds. This folding 
was succeeded by the entry from the east of a Senonian marine transgression, 
