Picea glauca (fossil white spruce wood) (Upper Pleistocene; Sharonville, Ohio, USA) 1 : 無料・フリー素材/写真
Picea glauca (fossil white spruce wood) (Upper Pleistocene; Sharonville, Ohio, USA) 1 / 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 | Picea glauca (Mönch, 1907) - fossil white spruce wood from the Pleistocene of Ohio, USA. (public display, Cincinnati Museum of Natural History & Science, Cincinnati, Ohio, 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.The most conspicuous group of living plants is the angiosperms, the flowering plants. They first unambiguously appeared in the fossil record during the Cretaceous. They quickly dominated Earth's terrestrial ecosystems, and have dominated ever since. This domination was due to the evolutionary success of flowers, which are structures that greatly aid angiosperm reproduction.Seen here is fossil wood from a Late Pleistocene peat bog in Ohio. The wood is from a white spruce, which is a gymnosperm, not an angiosperm.------------------From exhibit signage:What are spruce logs doing in Ohio bogs?Spruce trees don't grow in Ohio unless we plant them in our yards. The closest wild spruce are in northern Michigan. But we often find spruce wood in Ohio peat bogs. It's preserved from when the last glacier was here.This trunk is from a white spruce from near Sharonville, just north of Cincinnati.------------------Classification: Plantae, Pinophyta, Pinopsida, Pinales, PinaceaeLocality: unrecorded/undisclosed site near the town of Sharonville, north of Cincinnati, southwestern Ohio, USA------------------See info. at:en.wikipedia.org/wiki/Picea_glauca |
| 撮影日 | 2007-03-21 12:54:16 |
| 撮影者 | James St. John |
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