Pine rock

Japanese: 松岩 - まついわ

A colloquial name for charred wood fossils found in coal beds. It is said to have originated in the Chikuho coalfields of Kyushu, but is widely used in coal mines throughout the country. They are usually silicified and hard. Most tree trunks are found lying on their sides, but standing trees are also found. Their occurrence is widely investigated, and the causes of their allochthonous or in situ origin are discussed. Japanese coalfields are dominated by conifers.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

炭層中にある炭化した木の化石の俗称。九州筑豊炭田地方から出た言葉といわれるが，各地の炭鉱で広く用いられている。普通，ケイ化していて硬い。樹幹の横倒しが多いが，立ち木もある。その産状を広範囲に調べて，異地性や現地性の成因が論じられる。日本の炭田では針葉樹が多い。

出典　ブリタニカ国際大百科事典小項目事典ブリタニカ国際大百科事典小項目事典について　情報

<<: Matsuura [city] - Matsuura

>>: Yukan Matsui