File:Stigmaria (fossil tree root) (lower Pottsville Group, Lower Pennsylvanian; Jackson North roadcut, Ohio, USA) 1 (40121216985).jpg
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[edit]_(lower_Pottsville_Group,_Lower_Pennsylvanian;_Jackson_North_roadcut,_Ohio,_USA)_1_(40121216985).jpg&action=edit§ion=1){kind=link}
| Description |
Stigmaria fossil root from the Pennsylvanian of 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. Shown above is Stigmaria, which is a form genus for the roots of large arborescent lycopods (= scale trees) common during the Pennsylvanian ("Age of Coal Swamps"). Stigmaria is distinctive in having a cylindrical shape (if not compressed and distorted) and numerous pits. Classification: Plantae, Lycophyta, Lepidodendrales, Lepidodendraceae Stratigraphy: sandstone above carbonaceous shale above the "Sharon" Conglomerate, lower Pottsville Group, Lower Pennsylvanian Locality: Jackson North Outcrop - roadcut along the southwestern side of Rt. 35, immediately southeast of the Rt. 35-Lloyds Bridge Road intersection (the northwestern intersection - there are two of them), north of the town of Jackson, northwest-central Jackson County, southern Ohio, USA (39° 06’ 32.94” North latitude, 82° 40’ 39.99” West longitude) |
| Date | |
| Source | Stigmaria (fossil tree root) (lower Pottsville Group, Lower Pennsylvanian; Jackson North roadcut, Ohio, USA) 1 |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/40121216985 (archive). It was reviewed on 8 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:09, 8 October 2019 | | 3,234 × 1,969 (5.43 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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