C R Twidale
Biographic Data
| ID | 1686584 |
|---|---|
| NAME | C R Twidale |
| GIVEN NAMES | C R |
| FAMILY NAME | Twidale |
| SIGNATURE | TWIDALE C R |
| AFFILIATIONS | The University of Adelaide |
| ORCID | 0009-0003-9679-7922 |
| VERIFIED | Yes |
| TOTAL WORKS | 34 |
| TOTAL CITATIONS | 33 |
| WORKS AS AUTHOR | 34 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 1956 |
| LATEST PUBLICATION YEAR | 2019 |
| H-INDEX | 3 |
Lateral stability of central Australian longitudinal dunes
Some authors consider that linear dunes migrate laterally on a grand scale, much as rivers move across floodplains. Others have concluded that lateral movement is limited in time and space. During the phase of dune initiation, small ribbons of sand formed in the lee of obstacles merge and coalesce to form recognisable linear dunes. Repeat observations demonstrate that mature sand ridges change position laterally a few metres either way within clo…
Pre‐Quaternary Landforms and Landscapes
The conventional view that, with the exception of exhumed features, landscapes are of later Cenozoic (Quaternary) age is based on flawed assumptions. For example, weathering and erosion are not equally distributed over the land surface. As a result, considerable landscape elements of Paleogene and early Neogene ages survive, as do significant elements of Mesozoic derivation. Cretaceous and Jurassic features are widely reported, and Triassic forms…
The Lochiel Landslip in 2010 and the Significance of Reinforcement Mechanisms
The Lochiel Landslip was initiated in August 1974. It was the result of heavy winter rains, but was facilitated by the occurrence of hydrophilic clay interbedded with the quartzitic country rock. Monitoring has shown that whereas most of the minor features within the mass movement have been degraded and subdued, the headwall region remains active. The backing bluff that defines the tension scar has receded between 5 and 10 m during the last decad…
J.T. Jutson and the Work of the Wind in Shaping the Landscape
For a brief period about a century ago, reputable scientists gave credence to the idea that wind was capable of regional planation. Among them was J.T. Jutson, whose publications exerted considerable influence both in Australia and overseas. He differentiated between deflation and corrasion (sand-blasting) and in 1914 attributed major as well as minor landscape features to their activity. He ascribed the westward migration of salinas and the shap…
J.R. Logan's 1846 observations on Pulau Ubin, Singapore
J.R. Logan was an amateur naturalist who migrated to, and lived his working life in, the Malay Peninsula during the mid‐nineteenth century. His taste for travel was insatiable and he made perceptive observations from which he derived significant general conclusions concerning the granite landforms of the Singapore area. In particular, he recognized what are today called unequal activity and reinforcement effects – the suggestion that, once in tra…
The age of the palaeodunefield of the northern Murray Basin in South Australia
Commentary
Though most information presented in tourist signage is sound, some is not only severely flawed, but also unethical in that false claims are made, language is ambiguous, interpretations are irrational and explanations are confused and even internally contradictory. One site which illustrates these weaknesses is considered in some detail, as are efforts to have the signage corrected. The most effective way of ensuring the best possible result is f…
Comment on “ 10 Be and 26 Al Evidence for Exceptionally Low Rates of Australian Bedrock Erosion and the Likely Existence of Pre- Pleistocene Landscapes” (Bierman and Turner, 1995)
The early Cretaceous marine transgression and its significance for landscape interpretation
Significant elements of the Australian landscape date from Mesozoic or earlier times. Australia did not separate completely from other Gondwanan components until Early Tertiary times and these Mesozoic and older elements can therefore be regarded as Gondwanan. During the separation and northern drift of the continent and particularly in Late Jurassic and earlier Cretaceous times the sea invaded and spread across much of the erstwhile landmass. Th…
The gawler ranges, South Australia
The volcanic residuals of the Gawler Ranges together form an extensive massif that in its gross morphology differs markedly from most exposures of silicic volcanic rocks. The upland developed in two stages, the first involving differential fracture‐controlled subsurface weathering, the second the stripping of the regolith. As a result, an irregular weathering front was exposed, with domical projections prominent. These bornhardts are etch forms, …
Ancient Australia
Geomorphology
The Lochiel Landslip, South Australia
The Lochiel Landslip is a large mass movement involving the downslope slide of about 0.25 x 106 tonnes of quartzite. The slippage took place along bedding planes lubricated by attenuated interbeds and lenses of montmorillonite and late in a very wet winter. All the evidence points to the slip having formed very quickly during the early hours of 9 August 1974, though the main tension crack began to open some weeks earlier. Many tension cracks have…
C. D. Ollier's 'Evolutionary Geomorphology of Australia
Oilier urges that most of the models and concepts commonly used in the analysis and interpretation of landscapes have little application in the Australian context. Instead, it is suggested, the answers are to be found in the responses of continents to changing tectonic activities and varying global locations. Plate tectonics gives another important dimension to geomorphological interpretation but at another, more immediate, level recourse must st…
Granitic Inselbergs
Origin of minor sandstone landforms
Castellated inselberg
Minor granite landforms associated with the release of compressive stress
Distribution of relic ‘lands’ or strip fields in South Australia
Relic ‘lands’ or strip fields are widely preserved in southern South Australia, particularly in the Mid North region and the southern Flinders and Mt Lofty ranges. They have also been identified on Yorke and southern Eyre peninsulas, Kangaroo Island, the Olary upland, and the western Murray Plains. Thus, despite their fragile nature and the many agencies that have operated to destroy them, many have survived in the South Australian landscape. The…
Kappakoola dunes — aeolian landforms induced by man
The Kappakoola dunes are located on central Eyre Peninsula, in South Australia. These masses of sand stand out from the northwest‐southeast trending longitudinal dunes of the regional pattern because they are devoid of vegetation and in detail change in morphology from day to day according to the wind direction. The dunes are demonstrably of recent origin and are developed as a result of the deflation of the A‐horizon of a soil formed on the near…
Evolution of Sand Dunes in the Simpson Desert, Central Australia
Structural Landforms
Up to the end of last century, landforms were viewed largely as expressions of the structure of the earth's underlying crust. But such interpretations were concerned for the most part with generalities and broad effects; the subtleties of structural factors became overshadowed first by cyclic explanations and then by the modern emphasis on process and climatic geomorphology. This book arose from the neglect of structural factors in geomorphologic…
Landform Development in the Lake Eyre Region, Australia
Origin and Implications of the A‐tent, a Minor Granite Landform
The imprint of the plough
Evolution of Sand Dunes in the Simpson Desert, Central Australia
A ‘perfect desert’ transformed
(1971). A ‘perfect desert’ transformed: the agricultural development of Northwestern Eyre Peninsula, South Australia. Australian Geographer: Vol. 11, No. 5, pp. 437-454
Commentary
Though most information presented in tourist signage is sound, some is not only severely flawed, but also unethical in that false claims are made, language is ambiguous, interpretations are irrational and explanations are confused and even internally contradictory. One site which illustrates these weaknesses is considered in some detail, as are efforts to have the signage corrected. The most effective way of ensuring the best possible result is f…
Ancient Australia
Origin and Implications of the A‐tent, a Minor Granite Landform
Granitic Inselbergs
Distribution of relic ‘lands’ or strip fields in South Australia
Relic ‘lands’ or strip fields are widely preserved in southern South Australia, particularly in the Mid North region and the southern Flinders and Mt Lofty ranges. They have also been identified on Yorke and southern Eyre peninsulas, Kangaroo Island, the Olary upland, and the western Murray Plains. Thus, despite their fragile nature and the many agencies that have operated to destroy them, many have survived in the South Australian landscape. The…
The gawler ranges, South Australia
The volcanic residuals of the Gawler Ranges together form an extensive massif that in its gross morphology differs markedly from most exposures of silicic volcanic rocks. The upland developed in two stages, the first involving differential fracture‐controlled subsurface weathering, the second the stripping of the regolith. As a result, an irregular weathering front was exposed, with domical projections prominent. These bornhardts are etch forms, …
The Lochiel Landslip, South Australia
The Lochiel Landslip is a large mass movement involving the downslope slide of about 0.25 x 106 tonnes of quartzite. The slippage took place along bedding planes lubricated by attenuated interbeds and lenses of montmorillonite and late in a very wet winter. All the evidence points to the slip having formed very quickly during the early hours of 9 August 1974, though the main tension crack began to open some weeks earlier. Many tension cracks have…
Landform Development in the Lake Eyre Region, Australia
The imprint of the plough
Pediments at Naraku, North‐West Queensland
Der 'Bienenkorb', eine neue morphologische Form aus Nord-Queensland, Nord-Australien
Pediments at Naraku, North‐West Queensland
A reconnaissance survey of the coastline of the Leichhardt‐Gilbert area of North‐West Queensland
(1956). A reconnaissance survey of the coastline of the Leichhardt‐Gilbert area of North‐West Queensland. Australian Geographer: Vol. 6, No. 5, pp. 14-20
Longitudinal Profiles of Some Glacial Overflow Channels
Peel found in Northumberland that each of the two profiles examined in detail are of a or up-and-down form. The northern and southern slopes of the Beldon Cleugh channel are of almost equal length; peat fills a large depression at the crest of the hump, and various minor concavities occur on the northern slope. By contrast, the East Dipton channel E ^^ W possesses no complications in the way of peat accumulations but the eastern slope is much lon…
Regent and future developments in the Labrador Peninsula
Precis de Geomorphologie
Abandoned ingrown meander
Weather pit (Gnamma)
Origin and Implications of the A‐tent, a Minor Granite Landform
The imprint of the plough
A ‘perfect desert’ transformed
(1971). A ‘perfect desert’ transformed: the agricultural development of Northwestern Eyre Peninsula, South Australia. Australian Geographer: Vol. 11, No. 5, pp. 437-454
Evolution of Sand Dunes in the Simpson Desert, Central Australia
Structural Landforms
Up to the end of last century, landforms were viewed largely as expressions of the structure of the earth's underlying crust. But such interpretations were concerned for the most part with generalities and broad effects; the subtleties of structural factors became overshadowed first by cyclic explanations and then by the modern emphasis on process and climatic geomorphology. This book arose from the neglect of structural factors in geomorphologic…
Landform Development in the Lake Eyre Region, Australia
Kappakoola dunes — aeolian landforms induced by man
The Kappakoola dunes are located on central Eyre Peninsula, in South Australia. These masses of sand stand out from the northwest‐southeast trending longitudinal dunes of the regional pattern because they are devoid of vegetation and in detail change in morphology from day to day according to the wind direction. The dunes are demonstrably of recent origin and are developed as a result of the deflation of the A‐horizon of a soil formed on the near…
Minor granite landforms associated with the release of compressive stress
Distribution of relic ‘lands’ or strip fields in South Australia
Relic ‘lands’ or strip fields are widely preserved in southern South Australia, particularly in the Mid North region and the southern Flinders and Mt Lofty ranges. They have also been identified on Yorke and southern Eyre peninsulas, Kangaroo Island, the Olary upland, and the western Murray Plains. Thus, despite their fragile nature and the many agencies that have operated to destroy them, many have survived in the South Australian landscape. The…
Origin of minor sandstone landforms
Castellated inselberg
C. D. Ollier's 'Evolutionary Geomorphology of Australia
Oilier urges that most of the models and concepts commonly used in the analysis and interpretation of landscapes have little application in the Australian context. Instead, it is suggested, the answers are to be found in the responses of continents to changing tectonic activities and varying global locations. Plate tectonics gives another important dimension to geomorphological interpretation but at another, more immediate, level recourse must st…
Granitic Inselbergs
The Lochiel Landslip, South Australia
The Lochiel Landslip is a large mass movement involving the downslope slide of about 0.25 x 106 tonnes of quartzite. The slippage took place along bedding planes lubricated by attenuated interbeds and lenses of montmorillonite and late in a very wet winter. All the evidence points to the slip having formed very quickly during the early hours of 9 August 1974, though the main tension crack began to open some weeks earlier. Many tension cracks have…
Ancient Australia
Geomorphology
The early Cretaceous marine transgression and its significance for landscape interpretation
Significant elements of the Australian landscape date from Mesozoic or earlier times. Australia did not separate completely from other Gondwanan components until Early Tertiary times and these Mesozoic and older elements can therefore be regarded as Gondwanan. During the separation and northern drift of the continent and particularly in Late Jurassic and earlier Cretaceous times the sea invaded and spread across much of the erstwhile landmass. Th…
Geography (28 works) · Geology (20 works) · Geology (19 works) · Archaeology (15 works) · Geological formations and processes (11 works) · Geology and Paleoclimatology Research (11 works) · Geomorphology (10 works) · Landform (10 works) · Physical geography (10 works) · Landslides and related hazards (7 works)