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RE: Yixian Trees

>From the photos they seem pretty circular in cross section:


Publications on fossil tree trunks from the much earlier Tiaojishan Formation 
report that they were preserved in situ, standing upright, in tuff. So 
flattening should not be expected as it would if they were deposited on a 
bedding plane.

From: owner-DINOSAUR@usc.edu [owner-DINOSAUR@usc.edu] on behalf of David 
Marjanovic [david.marjanovic@gmx.at]
Sent: Wednesday, August 01, 2012 6:46 PM
Subject: Re: Yixian Trees

> Cool, thanks. 1.9 meters in  diameter might be comparable to a modern
 > day podocarp standing 30 meters tall.

But are such logs preserved in their original 3D shape? Or are they
squished flat to some degree? The bones from there are almost completely
flattened after all...