silicified

It might have been in some comments elsewhere, or maybe in something I haven't posted yet: the occurrence of hydrocarbons in vugs in silicified, Hg-bearing, Au-anomalous serpentinite near the McLaughlin gold mine - that was what I was referring to.

At it Again Silver Fox 2008

Kevin Pickering, a geologist at University College London who specializes in sedimentary rocks, said, "The photos appear to show iron-stained sedimentary rocks, probably thin beds of silicified sandstones and shales, which were most likely laid down in a marine environment a long time ago."

Raiders of the Faux Ark 2007

Mr. Quekett, having kindly examined some specimens, finds that it is “silicified CONIFEROUS WOOD of the ARAUCARIAN type; and the nearest allied wood that he knows of is that found, also in a fossil state, in New South Wales.”

Missionary Travels and Researches in South Africa 2004

A great many silicified trees are met with lying on the ground all over this part of the country; some are broken off horizontally, and stand upright; others are lying prone, and broken across into a number of pieces.

Missionary Travels and Researches in South Africa 2004

The gray sandstone rock having silicified trees lying on it is of these dimensions.

Missionary Travels and Researches in South Africa 2004

At the bottom we found a forest of large silicified trees, all lying as if the elevation of the range had made them fall away from it, and toward the river.

Missionary Travels and Researches in South Africa 2004

These were petrified trees, eleven being silicified, and from thirty to forty converted into coarsely-crystallised white calcareous spar.

Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle 2003

Great prostrate silicified trunks of trees, embedded in a conglomerate, were extraordinarily numerous.

Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle 2003

These circumstances are obvious to everybody, but no geologist has yet explained to us the causes of such changes as may have produced that rich black mould, on which trees, now silicified, formerly grew; or these wide plains and downs of rich earth, above a red sandstone formation.

Journal of an Expedition into the Interior of Tropical Australia 2003

From this resemblance I expected to find silicified wood, which is generally characteristic of those formations.

Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle 2003