 Quote by Andre
Interesting, I've not come across publications yet that register, describe the mineralization process in terms of temperature and conditions versus time. I have seen a vertebra of a Narwhal, still totally bone, found in the arctic, that was beyond carbon dating (>50,000 years), but assumed to be from the last interglacial, some 120,000 years ago.
Also, we have three quaternary fauna's in the North Sea here, the youngest is early Holocene, some 10,000- 7000 years ago, with no mineralisation, then an end Pleistocene fauna, carbon dated some 30-40,000 years ago, with some specimens partially mineralized and then a early to mid pleistocene fauna, estimated between 0.7 and 2 million years ago, all fully mineralized/petrified. |
Andre, thanks for your remarks. Much appreciated.
Last summer I climbed up some cliffs above Blue Lake and climbed into a pocket in the rock formed by a baby rhinocerous, no kidding!
http://www.historylink.org/index.cfm...m&file_id=9409 <--This link gives the time at 15 million years ago, but that may be from uniformitarian researches.
I have to amend my original statement with respect to the 18,000 figure for formation of the petrified wood.
Formed then? No.
Exposed then, yes.
The formation time was more likely with the lava flows which preceded the Lake Missoula flooding.
My hiking partner tells me many of the flows are sedimentary deposits of various types, from gravels to sandstones to clays. In every type of interlayered deposit are found petrified woods, which must have been in some way water borne to their current site. The combination of that water with the abundant silica from hot lava flowing over providing the necessary concentration or possibly saturation of silica required for the petrifaction process, he says. The petrifaction details my hiking partner collected nearby included cellular structures showing petrifaction that he said must happen quickly when the conditions are right. The Missoula floods exposed petrified woods at many levels as well as unpetrified woods at a level several flows below the one we strolled around. My friend obviously thinks the lava flows could have been much more recent, about which I don't know.
Respectfully submitted,
Steve
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