Talk:Fossilization (palaeontology): Difference between revisions

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imported>Nereo Preto
(Carbonate preservation)
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== Carbonate preservation ==
I am reading this article, which is indeed good - one of the finest among Earth Science I should say.
I have some questions about carbonate preservation, though.
* Ideal conditions for carbonate preservation are normally found in organic-rich shelf sediments
:Why organic-rich? Organic matter decay usually lower the pH, leading to dissolution. Or, do you mean "rich in living organisms" which shells may be fossilized? If so, this concept could be expressed more clearly.
* Sulfate reduction is required for cementation to occur
:Not sure about that. Do you have a reference for this? Note that seawater is naturally supersaturated with respect to calcium carbonate. Also, cementation in continental environments (e.g., caves, travertines) do not need sulphur to take place.
Just two minor notes. Keep on going with the good job! --[[User:Nereo Preto|Nereo Preto]] 09:37, 27 September 2007 (CDT)

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 Definition:  The set of geological processes that convert organic remains into fossils. [d] [e]
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Carbonate preservation

I am reading this article, which is indeed good - one of the finest among Earth Science I should say. I have some questions about carbonate preservation, though.

  • Ideal conditions for carbonate preservation are normally found in organic-rich shelf sediments
Why organic-rich? Organic matter decay usually lower the pH, leading to dissolution. Or, do you mean "rich in living organisms" which shells may be fossilized? If so, this concept could be expressed more clearly.
  • Sulfate reduction is required for cementation to occur
Not sure about that. Do you have a reference for this? Note that seawater is naturally supersaturated with respect to calcium carbonate. Also, cementation in continental environments (e.g., caves, travertines) do not need sulphur to take place.

Just two minor notes. Keep on going with the good job! --Nereo Preto 09:37, 27 September 2007 (CDT)

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