Results 111 to 120 of about 313 (146)

An Electron Optical investigation of Aluminosilicate Cements in Silcretes

Clays and Clay Minerals, 1992
Abstract Silcretes developed within the in situ regolith in the Barr Smith Range, Western Australia, were investigated using optical and electron-beam techniques. One of the cementing agents in these silcretes showed gel-like optical properties and had a variable ...
Balbir Singh, R. J. Gilkes, C. R. M. Butt   +2 more
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Diagenetic silcrete and formation of silcrete ventifacts and aeolian gold placers in Central Otago, New Zealand

New Zealand Journal of Geology and Geophysics, 2005
Abstract A diagenetic silcrete horizon from c. 1 to >6 m thick is commonly present within fluvial quartz sandstones and pebble conglomerates of Eocene Hogburn Formation and early‐middle Miocene Dunstan Formation in Central Otago.
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Detecting Heat Treatment on Silcrete: Experiments with Methods

Journal of Archaeological Science, 1997
Abstract We describe experiments aimed at detecting heat treatment of silcrete, a siliceous rock of inhomogeneous lithology widely used in prehistoric Australia. Our samples ( N =66) come from eastern New South Wales. Two methods widely used on other materials are found to be inadequate: scanning electron microscope (SEM) analyses allow conflicting ...
Martin Rowney, J.Peter White
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Determining the source of silcrete sarsen stones

Journal of Archaeological Science: Reports, 2019
Abstract Materials used in the construction of man-made structures can reveal information about societies, their environment, culture and mobility. Cultures throughout human history have used natural stone to construct funerary monuments and tool technologies.
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Silcrete procurement system in Uruguayan prehistory

Journal of Archaeological Science: Reports, 2017
Abstract This paper summarizes information on the role of silcrete rocks as raw material in Uruguayan Prehistory. The spatial distribution of sources, the procurement strategies and projectile point technology are discussed. We present a lithic database for Northern, Central and Southern Uruguay, especially from the Los Indios archaeological site ...
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A Petrographic Study of Silcrete from Inland Australia

SEPM Journal of Sedimentary Research, 1978
ABSTRACT Silcrete forms a remnant siliceous caprock over extensive areas of the Australian interior. Thin sections reveal considerable preservation of primary textural and mineralogical characteristics. Other features including abundant turbid, cryptocrystalline matrix, examples of dissolution embayments and floating textures are indicative of intense ...
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Heat Treatment Identification of Silcrete Artefacts in Queensland

2023
Heat treatment is the practice of thermally modifying the physiochemical properties of rocks, such as silcrete, for the purpose of stone tool manufacture. Identifying this practice in the archaeological record can inform on resource procurement and risk management strategies, as well as regional diversification and convergent evolution of technology ...
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Mineralogical Forms of Silica and their Sequence of Formation in Silcretes

SEPM Journal of Sedimentary Research, 1987
The paragenesis and the sequence of formation of silica polymorphs have been studied in three examples of silicification in the regolith of the Paris Basin and the Central Massif of France. The initial silica deposits are most frequently opal with varying degrees of structural organization.
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Silcrete in Australia

Palaeogeography, Palaeoclimatology, Palaeoecology, 1980
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Silcrete and basalt - discussion

Zeitschrift für Geomorphologie, 1993
R. W. Young, C. R. Twidale, J. T. Hutton
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