This is a fossilized tree root called Stigmaria.
这是一种叫做 Stigmaria 的化石树根。
Stigmaria
原声例句
阿尔伯塔大学-恐龙古生物学
英语百科
Stigmaria
Stigmaria are a type of branching tree root fossil found in Carboniferous rocks. They were the roots of coal forest lycopsid trees such as Sigillaria and Lepidodendron. Each trunk tended to have four of those roots. Stigmaria is a form taxon, as the genus and species of the plant bearing the root is not identified.
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