Fig. 7
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Internal structures of the silicified bodies. (a) Botryoidal or mammillary (‘custard-like’) surface shape of a quartzite lens; sand pit Bonnevault, Larchant (Seine-et-Marne). (b) Internal growth bands with tightly cemented fringes; sand pit Villejust (Essonne). (c) Idem b, sand pit les Gondonnières (Larchant, Seine-et-Marne). After Thiry and Maréchal, (2001).
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