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Principles of soil occurrence in the lower Coal River Valley, South-East Tasmania

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Holz, GK (1994) Principles of soil occurrence in the lower Coal River Valley, South-East Tasmania. PhD thesis, University of Tasmania.

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Abstract

Techniques and approaches from the disciplines of pedology and geomorphology
have been integrated to investigate the distribution and properties of soils, the development
of landscapes, and to provide insights about previous climates and pedogenic processes in
two areas in SE-Tasmania. The study areas include a coalesced fan landscape on a farm near
Cambridge owned by the University of Tasmania, and a landscape of predominantly valley
floor alluvial deposits in the Coal River Valley north of Richmond.
Stratigraphic investigations show the landscape of the University Farm to be a
pediment cut in predominantlyTertiary sediments covered by a veneer of Quaternary clastic
deposits, with isolated outliers of Jurassic dolerite and Triassic sandstone rising above it.
Stratigraphic units have been identified in the pedisediment based on differences in
composition (source and nature of the sediment) and age (relative position in the landscape,
degree of weathering and dissection). Sedimentological evidence suggests that these units
have been formed by processes of lateral planation and alluvial and debris flow deposition
ie., processes associated with both pediment and alluvial fan formation.
Soil properties are related to the characteristics of each stratigraphic unit. They are
attributable to both the composition and age of the unit. Sand infills have been identified in
some soils and investigated using quartz grain morphoscopy and granulometric analysis. The
infill phenomenon can be used as a time stratigraphic marker and provides insights about
previous climatic conditions. Ferricrete and silcrete deposits were shown to have formed
over discrete intervals of time due to precipitation from iron and silicon bearing groundwater
flowing from higher level Jurassic dolerite and Triassic sandstone across hydraulic
discontinuities in Tertiary sediments.
The Coal River Valley has been shown to have a complex distribution of Quaternary
sediments. These include alluvial deposits in a sequence of alluvial terraces (five
stratigraphic units identified), pedisediment deposited on a surface cut in Tertiary basalt and
Tertiary sediments (two stratigraphic units identified), and aeolian deposits (two units
described). Soil profile classes have been identified developed in the stratigraphic units.
Chronofunctions of properties of soils on alluvial stratigraphic units have been
established, the most useful of which are depth functions of %Total K (best for soils on
older units) and %Total P (best for soils on younger units). Soil morphological development
with age has been found to be generally consistent with findings of previous studies in
eastern Australia.

Item Type: Thesis (PhD)
Keywords: Soils, Soils
Copyright Holders: The Author
Copyright Information:

Copyright 1994 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Includes bibliographical references (p. 236-253). Col. folded map in pocket at back of vol. Thesis (Ph.D.)--University of Tasmania, 1994

Date Deposited: 19 Dec 2014 02:34
Last Modified: 27 Jun 2017 04:03
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