Petrified wood

The image shows the center of a polished slice of a petrified tree from the late Triassic period (approximately 230 million years ago) found in Arizona. The remains of insects can be detected in an enlarged image.

Petrified log in Paleorrota geopark, Brazil

Petrified log at the Petrified Forest National Park

Petrified wood (from the Greek root petro meaning "rock" or "stone"; literally "wood turned into stone") is the name given to a special type of fossilized remains of terrestrial vegetation. It is the result of a tree or tree-like plants having completely transitioned to stone by the process of permineralization. All the organic materials have been replaced with minerals (mostly a silicate, such as quartz), while retaining the original structure of the stem tissue. Unlike other types of fossils which are typically impressions or compressions, petrified wood is a three-dimensional representation of the original organic material. The petrifaction process occurs underground, when wood becomes buried under sediment or volcanic ash and is initially preserved due to a lack of oxygen which inhibits aerobic decomposition. Mineral-laden water flowing through the covering material deposits minerals in the plant's cells; as the plant's lignin and cellulose decay, a stone mold forms in its place. The organic matter needs to become petrified before it decomposes completely. A forest where such material has petrified becomes known as a petrified forest.

单词	Petrified Forest
释义	Petrified Forest 原声例句美国国家公园 The Petrified Forest National Park is one of the wonders of Arizona. 石化森林国家公园是亚利桑那州的奇迹之一。精选英语短文 In 25 years of excavating the petrified forest of Lesbos, he had unearthed nothing like it. 在挖掘莱斯博斯岛石化森林 25 年的时间里，他从未发掘过类似的东西。精选英语短文 Stretching across almost all of the Greek island's western peninsula, the petrified forest, a Unesco global geopark, is among the largest in the world. 石化林几乎横跨整个希腊岛屿的西部半岛，是联合国教科文组织世界地质公园，是世界上最大的地质公园之一。精选英语短文 " The petrified forest is the first stop on our fieldtrip, " said Chronis Tzedakis, a professor of physical geography at University College London, who has been running field classes on the Aegean isle for the past decade. “石化森林是我们实地考察的第一站， ” 伦敦大学学院自然地理学教授 Chronis Tzedakis 说，他过去十年一直在爱琴海岛上开设实地课程。 “它永远不会让人失望. . . 英语百科 Petrified wood Petrified wood (from the Greek root petro meaning "rock" or "stone"; literally "wood turned into stone") is the name given to a special type of fossilized remains of terrestrial vegetation. It is the result of a tree or tree-like plants having completely transitioned to stone by the process of permineralization. All the organic materials have been replaced with minerals (mostly a silicate, such as quartz), while retaining the original structure of the stem tissue. Unlike other types of fossils which are typically impressions or compressions, petrified wood is a three-dimensional representation of the original organic material. The petrifaction process occurs underground, when wood becomes buried under sediment or volcanic ash and is initially preserved due to a lack of oxygen which inhibits aerobic decomposition. Mineral-laden water flowing through the covering material deposits minerals in the plant's cells; as the plant's lignin and cellulose decay, a stone mold forms in its place. The organic matter needs to become petrified before it decomposes completely. A forest where such material has petrified becomes known as a petrified forest.
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Petrified Forest

Petrified wood