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The Biostratigraphy of the Tasmanian Marine Tertiary

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Quilty, PG (1972) The Biostratigraphy of the Tasmanian Marine Tertiary. Papers and Proceedings of the Royal Society of Tasmania, 106. pp. 25-44. ISSN 0080-4703

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Abstract

Tertiary marine rocks occur in small scattered
outcrops around Tasmania's north and west coasts,
on some islands in Bass Strait, and below sea
level in Mussel Roe Bay. All occurrences except
those in Mussel Roe Bay and on Preservation
Island have been recorded previously. From 64
samples, about 300 categories (form, subspecies,
species, genus etc,) of foraminifera have been
identified. Planktonic species are generally poorly
preserved, but good faunas have been identified
from Fossil Bluff, Brittons Swamp and Marrawah,
the latter in company with Lepidocyclina howchini
Chapman and Crespin and Amphistegina lessonii
d'Orbigny.
All rocks are of Early and Middle Miocene age
(Longfordian Batesfordian, Carter's Faunal
Units 6, 8 and 9) with the possible exception of
one sample from Mussel Roe Bay which may be
Late Oligocene (Janjukian, Faunal Unit 5).
All sediments are of shallow water origin,
deposited in depths of less than 20, usually less
than 10, fathoms. Water temperatures were those
of the Warm Temperate to Subtropical Zones in
Faunal Unit 6 time, Subtropical during Faunal
Unit 8 time and Tropical during Faunal Unit 9
time. Waters may have been slightly warmer in
the north-east than in the north-west during Faunal
Unit 6 time.
Sediments at about 100 feet below sea level in
Mussel Roe Bay, and at less than 150 feet above
sea level at Wynyard, King Island, Cape Grim,
Mt Cameron West, Marrawah, Daisy Creek and
Granville Harbour formed during a marine transgression
throughout Faunal Units 5 and 6, There
seems to be a Faunal Unit 7 hiatus which may
represent regression.
Higher level sediments (above sea level on
Cape Barren and Preservation Islands) and at
170-310 feet above sea level at Brittons Swamp,
Redpa, and Marrawah formed during another,
more extensive transgression in the time of Faunal
Units 8 and 9.
Comments are made on the age of some basalts
in the north-west of the State; on the relation of
these outcropping sediments to those of the Bass
Basin; on the common occurrence of large and
planktonic foraminifera in a single sample from
Marrawah; and a palaeogeographic map is presented.

Item Type: Article
Keywords: Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library
Journal or Publication Title: Papers and Proceedings of the Royal Society of Tasmania
Page Range: pp. 25-44
ISSN: 0080-4703
Collections: Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:

Copyright Royal Society of Tasmania

Date Deposited: 18 May 2012 05:05
Last Modified: 18 Nov 2014 04:32
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