Fossil wood (Morrison Formation, Upper Jurassic; Escalante Petrified Forest State Park, Utah, USA) 69 : 無料・フリー素材/写真
Fossil wood (Morrison Formation, Upper Jurassic; Escalante Petrified Forest State Park, Utah, USA) 69 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | Fossil wood in the Jurassic of Utah, USA.This fossil tree trunk is in the Morrison Formation, an Upper Jurassic succession that is widely distributed in many western American states. The Morrison consists of fluvial (river/floodplain) and lacustrine (lake) deposits, plus reddish-colored paleosol horizons. Dinosaur bones and dinosaur tracks are moderately common in Morrison Formation sediments. Exceptionally dinosaur-rich localities include Como Bluff in Wyoming, Dinosaur National Monument in Utah, Dinosaur Ridge in Colorado, and the Cleveland-Lloyd Quarry in Utah.This type of fossil wood is usually referred to as "petrified wood". It's a preservation style actually called "permineralization" - the small-scale porosity of buried wood or bone gets filled with minerals as groundwater percolates through. The most common permineralization mineral is quartz (SiO2). Cellular-level details can be preserved in permineralized wood, but some examples have little original botanical structure remaining.Stratigraphy: Brushy Basin Member, Morrison Formation, Upper JurassicLocality: trailside, Escalante Petrified Forest State Park, Utah, USA |
| 撮影日 | 2011-09-02 13:46:22 |
| 撮影者 | James St. John |
| タグ | |
| 撮影地 |