Talk:Chert
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Need references for the Precambrian fossil section and esp. the validity question. Vsmith 15:17, 27 Mar 2005 (UTC)
Refs added for PC fossils. Removed the qulaification below pending ref. support.
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- However, recent studies question the validity of most Precambrian fossils in chert and suggest that some of those fossils may be contaminants, fluid inclusions, or carbon threads formed abiologically.
With references it can be reinserted without the recent studies and some... Vsmith 03:14, 24 May 2005 (UTC)
[edit] Chalcedony vs chert
I've always used chert to describe a sedimentary rock, and chalcedony for alteration/hydrothermal/obvious later replacement products. After all, you can't see microstructural differences in the field.203.129.47.212 (talk) 06:29, 22 April 2008 (UTC)
