Arkell.1956.Jurassic..

452 AUSTRALASIA
The structure is complex and has not yet been fully elucidated. The
Southern Alps and neighbouring ranges consist largely of folded sedimentary
and metamorphic rocks, schists of undetermined age in the
west grading eastwards into less metamorphosed Upper Triassic beds
(Wellman & others, 1952). From the lie of the proved Jurassic, however, it
seems that the sediments were derived from lost land in the west and laid
down in a subsiding trough which ran longitudinally through both islands
FIG. 69.—The principal fossiliferous marine Jurassic outcrops of New Zealand.
Based on the Geological Survey map, 16 miles to i inch, 1947.
and bent round to the south-east just before emerging at the SE.
corner of the South Island.
Strong folding and compression of the geosyncline with all its contents,
up to Neocomian inclusive, took place during the Lower Cretaceous.
In the South Island, after folding, uplift and faulting, there was deep
erosion before initiation of a new cycle with deposition of transgressive
Albian and Upper Cretaceous. The new cycle of sedimentation continued
through most of the Tertiary, until brought to an end by the most recent
(late Tertiary) orogenic movements, characterised by folding, uplift,
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