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Re: really big question

> The Sol[...]nhofen matrix is micrite, correct?

I think so...

> A carbonate mud will harbor a vastly different microbiota
> than will a phylosilicate mud.

It is limestone, thus carbonate, in any case, and it is thought that
Ediacara-style cyanobacterial mats grew on it, facilitating preservation by
sealing the carcasses from the water, and explaining why the layers separate
so easily (they don't in Crayssac, which is a pretty similar rock, but was a
beach and not the floor of a lagoon).

> And a warm benthic envirnment is much
> different than a cold benthic environment

It must have been very warm. :-)