Lepidodendron sp. (Conemaugh Group, Middle Pennsylvanian; Consumers Mine, Harmarville, Pennsylvania, USA) 2 : 無料・フリー素材/写真
Lepidodendron sp. (Conemaugh Group, Middle Pennsylvanian; Consumers Mine, Harmarville, Pennsylvania, USA) 2 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Lepidodendron sp. - fossil scale tree from the Pennsylvanian of Pennsylvania, USA. (public display, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA)Plants are multicellular, photosynthetic eucaryotes. The oldest known land plant body fossils are Silurian in age. Fossil root traces of land plants are known back in the Ordovician. The Devonian was the key time interval during which land plants flourished and Earth experienced its first “greening” of the land. The earliest land plants were small and simple and probably remained close to bodies of water. By the Late Devonian, land plants had evolved large, tree-sized bodies and the first-ever forests appeared.Shown above is the well-preserved tree top of Lepidodendron, which was a large arborescent lycopod (= scale tree) common during the Pennsylvanian ("Age of Coal Swamps"). Lepidodendron is distinctive in having diamond-shaped leaf attachment scars on the tree trunk.------------------------------From museum signage:Lepidodendron was one of the most spectacular plants of the Pennsylvanian forest. It reached over 100 feet in height, with a straight trunk topped by extensive branches.This exceptional specimen of a Lepidodendron tree top was found in 1925 in the Consumers Mine (Wheeling Iron and Steel Company), Harmarville, Pennsylvania, just above the Upper Freeport Coal. It is early Middle Pennsylvanian in age.------------------------------Classification: Plantae, Lycophyta, LepidodendralesStratigraphy: roof rocks above the Upper Freeport Coal, basal Conemaugh Group, Middle PennsylvanianLocality: Consumers Mine, Harmarville-Oakmont, northeastern Allegheny County, western Pennsylvania, USA-------------------------See info. at:en.wikipedia.org/wiki/Lepidodendron |
| 撮影日 | 2012-11-17 13:00:11 |
| 撮影者 | James St. John |
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