A note on Dodgson’s Rock platform, Elkington quarry, and the origin of bornhardts on north-western Eyre Peninsula, South Australia
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Abstract
The excavation of what was Dodgson‘s Rock, now Elkington quarry, exposed a domical bedrock form that can be construed as a stage in the development of incipient bornhardts. It confirmed the earlier interpretation of the domical inselberg known as Ucontitchie Hill as a structural feature initiated by the differential etching in the shallow subsurface of compartments of granitic rock of contrasted fracture density and exposed by the erosional lowering of the densely fractured and weathered surrounds. Stages in the excavation provided evidence concerning the nature of sheet fractures and structures as well as the origin of breached arches or A-tents. Other bornhardts in the district (Mt Wudinna, Polda Rock, Little Wudinna Hill) as well as sundry additional inselbergs, turrets, and elevated platforms may be of a similar origin.
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Barbier, R. 1957. Aménagements hydroélectriques dans le sud du Brésil. Comptes Rendus Sommaire et Bulletin Societé Géologique de France 6, 877–892. DOI: https://doi.org/10.2113/gssgfbull.S6-VII.7.877
Baulig, H. 1956. Vocabulaire Franco-Anglo-Allemand de Géomorphologie. Les Belles Lettres, Paris.
Blès, J.L., Blanchin, R. 1986. Fracturation profonde des massifs rocheux granitiques. Documents du Bureau de Recherches Géologiques et Minières, 102. Service Géologique National, Orléans, 316 pp.
Bornhardt, W. 1900. Zur Oberflächengestaltung und Geologie Deutsch Ostafrikas. Reimer, Berlin, 595 pp.
Boyé, M., Fritsch, P. 1973. Dégagemente artificial d’un dôme crystallin au Sud-Cameroun. Travaux et Documents de Géographie Tropicale 8, 69-94.
Branner, J.C. 1896. Decomposition of rocks in Brazil. Geological Society of America Bulletin 7, 255–314. DOI: https://doi.org/10.1130/GSAB-7-255
Cushing, H.P., Fairchild, H.L., Ruedeman, R., Smyth, C.H. 1910. Geology of the Thousand Islands region. New York State Museum and Science Service Bulletin 145, 5-193.
Dale, T.N. 1923. The commercial granites of New England. United States Geological Survey Bulletin 738, 538 pp.
Falconer, J.D. 1911. The Geology and Geography of Northern Nigeria. Macmillan, London, 295 pp.
Ferris, G.M., Gray, N.D., Pain, A.M. 1998. Reconnaissance granite sampling of the Mesoproterozoic Hiltaba Suite Granite on northern Eyre Peninsula, South Australia, for Dimension Stone. PIRSA, Adelaide. Report Book 97–28. (CD-ROM).
Hassenfratz, J.H. 1791. Sur l’arrangement de plusieurs gros blocs de different pierres que l’on observe dans les montagnes. Annales de Chimie 11, 95–107
Heath, E., Franklin, E. 1986. Grain amid Granite. Jubilee 150 Project/D.C. Le Hunte, Adelaide, p. 32.
Jennings, J.N. Twidale, C.R. 1971. Origin and implications of the A-tent, a minor granite landform. Australian Geographical Studies 9, 41–53. https://doi.org/10.1111/j.1467-8470.1971.tb00242.x DOI: https://doi.org/10.1111/j.1467-8470.1971.tb00242.x
Logan, J.R. 1849. The rocks of Palo Ubin, with some remarks on the formation and structure of hypogene rocks and on the metamorphic theory. Lembaga Kebudjan Indonesia. Verhandlungen Genootschap van Kunsten en Wetenschappen (Batavia) 2, 3–43.
Martel, S.J. 2006. Effect of topographic curvature on near-surface stresses and application to sheeting joints. Geophysical Research Letters 33, https://doi.org/10.1029/2005GL024710 DOI: https://doi.org/10.1029/2005GL024710
Ruxton, B.P. 1958. Weathering and subsurface erosion at the piedmont angle, Balos, Sudan Geological Magazine 45, 353–377. DOI: https://doi.org/10.1017/S0016756800062944
Scrivenor, J.D. 1913. The geology of Malaya. Quarterly Journal of the Geological Society of London 69, 343–369. DOI: https://doi.org/10.1144/GSL.JGS.1913.069.01-04.22
Sutton, D. J., White, R. E. 1968. The seismicity of South Australia. Journal of the Geological Society of Australia 15, 25–32. DOI: https://doi.org/10.1080/00167616808728677
Tardyvas, R.K. 1969. Geophysical and morphological aspects, granite inselbergs. Yarwondutta Rocks, Eyre Peninsula. Quarterly Geological Notes. The Geological Survey of South Australia. 29, 1–6.
Teichert, C. 1947. Contemporary eustatic rise of sea level? Geographical Journal 109, 288–289. DOI: https://doi.org/10.2307/1789488
Trendall, A.F. 1962. The formation of ’apparent peneplains’ by a process of combined lateritisation and surface wash. Zeitschrift für Geomorphologie 6, 183–197.
Twidale, C.R. 1962. Steepened margins of inselbergs from north-western Eyre Peninsula. South Australia. Zeitschrift für Geomorphologie 6, 51–69.
Twidale, C.R. 1964. A contribution to the general theory of domed inselbergs. Conclusions derived from observations in South Australia. Transactions and Papers of the Institute of British Geographers 34, 91–113. DOI: https://doi.org/10.2307/621075
Twidale, C.R. 1986. A recently formed A-tent on Mt Wudinna, northwestern Eyre Peninsula, South Australia. Revue de Géomorphologie Dynamique 35, 21–24.
Twidale, C.R. 1987. Review of J. L. Blès. 1986. Fracturation profonde des massifs rocheux granitiques. Documents du B.R.G.M. 102. Progress in Physical Geography 11, 464. https://doi.org/10.1177/030913338701100314 DOI: https://doi.org/10.1177/030913338701100314
Twidale, C.R. 2023. The origin, age, and conservation of an ‘elevated platform’, Yarwondutta Rock, northwestern Eyre Peninsula South Australia. Cadernos Laboratorio Xeoloxico de Laxe. 45, 33–58. https://doi.org/10.17979/cadlaxe.2023.45.0.10155 DOI: https://doi.org/10.17979/cadlaxe.2023.45.0.10155
Twidale, C.R., Bourne, J.A. 1975. Episodic exposure of inselbergs. Geological Society of America Bulletin 86, 1473–1481. https://doi.org/10.1130/0016-7606(1975)86<1473:EEOI>2.0.CO;2 DOI: https://doi.org/10.1130/0016-7606(1975)86<1473:EEOI>2.0.CO;2
Twidale, C.R., Bourne, J.A. 2000. Rock bursts and associated neotectonic forms at Minnipa Hill, northwestern Eyre Peninsula, South Australia. Environmental and Engineering Geoscience 6, 129–140. https://doi.org/10.2113/gseegeosci.6.2.129 DOI: https://doi.org/10.2113/gseegeosci.6.2.129
Twidale, C.R., Bourne, J.A. 2003. Active dislocations in granitic terrains of the Gawler and Yilgarn cratons. Australia. and some implications. South African Journal of Geology 106, 71–84. https://doi.org/10.2113/1060071 DOI: https://doi.org/10.2113/1060071
Twidale, C.R., Bourne J.A. 2009. On the origin of A-tents (pop-ups), sheet structures and associated forms. Progress in Physical Geography 33, 147–162. https://doi.org/10.1177/0309133309338660 DOI: https://doi.org/10.1177/0309133309338660
Twidale, C.R., Campbell, E.M. 1984. Murphy Haystacks, Eyre Peninsula South Australia, Transactions of the Royal Society of South Australia 108, 175–183. https://archive.org/details/TransactionsRoy108Roya/page/175/mode/2up?view=theater
Twidale, C.R., Campbell, E.M., Foale, M.R. 1985. Ucontitchie Hill. Schmucker, Lutheran Publishing, Adelaide.
Twidale, C.R., Sved, G. 1979. Minor granite landforms associated with the release of compressive stress. Australian Geographic Studies 16, 161–174. https://doi.org/10.1111/j.1467-8470.1978.tb00326.x DOI: https://doi.org/10.1111/j.1467-8470.1978.tb00326.x
Twidale, C.R., Vidal Romaní, J.R. 2005. Landforms and Geology of Granite Terrains. Balkema, Leiden. DOI: https://doi.org/10.1201/9781439833704
Willis, B. 1934. Inselbergs. Association of American Geographers Annals 24, 123–129. DOI: https://doi.org/10.1080/00045603409357128
Willis, B. 1936. East African plateaus and rift valleys. Studies in Comparative Seismology. Washington DC, Carnegie Institute Publication 470, 1-358.