The geology of the St. Helens-Scamander area, Tasmania
Walker, KR (1957) The geology of the St. Helens-Scamander area, Tasmania. Papers and Proceedings of the Royal Society of Tasmania, 91 . pp. 23-46. ISSN 0080-4703
The Scamander Slate and Quartzite consist essentially
of a succession of stratified slates, quartzites
and sub-greywackes with a few siltstone bands,
which probably form part of the Mathinna Group.
They contain primitive plants (Hostimella (?) and
are regarded to be of Siluro-Devonian age. They
are intruded by a Devonian (?) quartz monzonite
batholith, and possibly at a later date by St.
Marys Porphyrite, which may however prove to be
a dacitic fiow. At present their structure is confusing;
close parallel folding occurs which is overfolded
from the west and complicated by numerous
minor fault breaks. Major faulting in the area
occurred in lower Tertiary, isolating the coastal
plain physiographic unit from the hinterland.
The Permian System which follows unconformably
has been divided into the following six formations:-
1. Sisters Granule Conglomerate.
2. Lohrey's Gully Sandstone and Calcareous
3. Enstone Park Limestone.
4. Binn's Gully Mudstone.
5. German Town Tillite.
6. Rays Hill Arkose.
The structure of these sediments is controlled
by the Mt. Nicholas dolerite sill which intrudes
them, and the concomitant faulting developed at
the time of its emplacement in the Jurassic.
Lower Tertiary faulting and sedimentation during
the Cainozoic resulted in the development of
Tertiary wash covering the coastal plain to 350 feet
above sea level, and probably the alluvial tin
deposits at st. Helens were formed at this time.
Economic considerations reviewed include potential
tin, tungsten, and copper deposits.
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|Keywords:||Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library|
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|Deposited On:||24 May 2012 18:00|
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