Moreover, its preservation is not of typical Burgess Shale type, but rather represents silicification associated with a'death mask'microbial mat, recalling the'Ediacara-type'preservation of the Precambrian Ediacara biota.
12.
Deprived of air, the organic matter could not rot and decay, but instead, over millions of years, underwent silicification, whereby each cell is individually fossilised and the appearance, if not the colour, of wood is retained.
13.
In the ancient rocks of Wales, Charnwood, the Pentland Hills, etc ., similar tuffs are known, but in all cases they are greatly changed by silicification ( which has filled them with opal, chalcedony and quartz ) and by devitrification.
14.
Since the advent of silicification, diatoms have made a significant impression on the fossil record, with major deposits of fossil diatoms found as far back as the early Cretaceous, and some rocks ( diatomaceous earth, diatomite, kieselguhr ) being composed almost entirely of them.
15.
The most common hydrothermal alteration assemblages are chloritic ( including Mg-rich ones ) and phyllic alteration ( dominated by sericite , mostly illite ), and also silicification, deep and shallow talcose alteration, and ferruginous ( including Fe oxides, carbonates and sulfides ) alteration.
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