silcreten.
/ˈsɪlkriːt/ Geology.
A quartzite formed of sand grains or pebbles cemented together by silica; a siliceous duricrust.
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the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [noun] > other siliceous
radiolarian chert1890
silcrete1902
radiolarite1910
1902 G. W. Lamplugh in Geol. Mag. IX. 575 I have the hardihood to suggest that the term might be complemented by equivalents,—‘silcrete’, for sporadic masses in loose material of the ‘greywether’ type, indurated by a siliceous cement.
1950 Antiquity 24 209 More than 90 per cent of these implements are of ‘ferricrete sandstone’, the others being of ‘silcrete sandstone’.
1977 A. Hallam Planet Earth 85 Bedrock became deeply weathered to give striking weathering crusts (duricrusts) composed of iron and aluminum oxides (in the case of ferricretes) or silica (in the case of silcretes).
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).
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n.1902