Silcrète — La silcrète est un type de conglomérat fin cimenté par de la silice. Il désigne aussi plus généralement toute croûte siliceuse. Sommaire 1 Terminologie 2 Formation et répartition 3 Usages préhistoriques … Wikipédia en Français
silcrete — ▪ mineral silica rich (silica) duricrust, an indurated, or hardened, layer in or on a soil. It generally occurs in a hot, arid climate where infrequent waterlogging causes silica to dissolve and be redeposited to cement soil grains together … Universalium
silcrete — noun An indurated duricrust formed when silica is dissolved and resolidifies as a cement … Wiktionary
silcrete — sil·crete … English syllables
silcrete — /ˈsɪlkrit/ (say silkreet) noun a conglomerate of rock fragments cemented by silica; traditionally favoured in the making of Aboriginal stone tools. {sil(ica) + (con)crete} …
silcrete — ˈsilˌkrēt noun ( s) Etymology: silica + 2concrete : a superficial quartzite formed by the cementation of rock fragments (as soil, sand, or gravel) by silica … Useful english dictionary
Blombos — 34°24′50.77″S 21°13′03.68″E / 34.4141028, 21.2176889 … Wikipédia en Français
Australia — /aw strayl yeuh/, n. 1. a continent SE of Asia, between the Indian and the Pacific oceans. 18,438,824; 2,948,366 sq. mi. (7,636,270 sq. km). 2. Commonwealth of, a member of the Commonwealth of Nations, consisting of the federated states and… … Universalium
Ganister — As defined in Jackson (1997), a ganister is hard, fine grained quartzose sandstone, or orthoquartzite, used in the manufacture of silica brick typically used to line furnaces. Ganisters are cemented with secondary silica and typically have a… … Wikipedia
Blombos Cave — has been recovered at the site and dates to c. 140,000 years ago.The symbolic significance of these finds suggests Middle Stone Age people were behaving in a cognitively modern way and had the advantages of syntactical language at least 80,000… … Wikipedia
