It looks like an ancient tree fossil.

这个好像是古树的化石。

youdao

No wonder I mistook it as a tree fossil.

怪不得我以为它是古树的化石呢。

youdao

As paleo-fossil also can not be called paleo-fossil jade, so silicified wood being called tree fossil jade is not properly.

再如，古生物化石也不能称为“古生物化玉”。所以将硅化木称“树化玉”是欠妥的。

youdao

But the researchers say the new fossil shows the Alvarezsauridae group split from birds much earlier on the evolutionary tree than was thought.

BBC: New dinosaur discovery solves evolutionary bird puzzle