TB,
As far as I'm aware, there are no known examples of what you ask, unless Edge has anything to add. There ARE petrified forests in formation, however.
http://sts.gsc.nrcan.gc.ca/...antic/nova/ns_fundy/spring.htm
Bay of Fundy
Spring tide drowns the forest, Amherst Marsh, NS.
The process of rising sea level is clearly seen here where the highest tides of the year have reached far into the forest. Trees are killed at the salt water limit and become gradually buried in the marsh mud. Their stumps are used to date when the tide reached any given level. Here, the tide has risen about 1 metre in the last 1000 years and many early colonial artifacts from the early 1600's are found at 30-40 cm depth.
Mark
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Occam's razor is not for shaving with.