Horizontal burrows in mudshale (Lowellville Shale, Lower Pennsylvanian; Beach City Dam outcrop, northeastern Ohio, USA) 2 : 無料・フリー素材/写真
Horizontal burrows in mudshale (Lowellville Shale, Lower Pennsylvanian; Beach City Dam outcrop, northeastern Ohio, 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 | Trace fossils in the Pennsylvanian of Ohio, USA. (handlens for scale)"Lowellville Shale" is the nickname used here for dark-colored mudshales overlying the Lowellville Limestone in the Pottsville Group of northeastern Ohio, USA.Just above the Lowellville Limestone at the Beach City Dam outcrop, the Lowellville Shale is fissile to flaggy, fossiliferous, black calcareous shale. Above that is non-flaggy, sparsely-fossiliferous, incompetent, black calcareous shale. Observed fossils include Posidonia bivalves, Trepospira gastropods, crinoid stem columnals, straight-shelled nautiloid cephalopods, coiled cephalopods, plants, and horizontal burrows.The Lowellville Shale and underlying Lowellville Limestone are part of the Pottsville Group, a Pennsylvanian-aged cyclothemic succession in eastern Ohio that contains nonmarine shales, marine shales, siltstones, sandstones, coals, marine limestones, and chert ("flint"). The lower Pottsville dates to the late Early Pennsylvanian. The upper part dates to the early Middle Pennsylvanian. The Lower-Middle Pennsylvanian boundary is apparently somewhere near the Boggs Member (?).Shown above are horizontal burrows in dark, fissile mudshale. Burrows are one example of trace fossil - any indirect evidence of ancient life. Trace fossils record evidence of the behavior of ancient organisms. Other examples of trace fossils include footprints, tracks, trails, borings, and bitemarks.Stratigraphy: Lowellville Shale, just above the Lowellville Limestone, Pottsville Group, upper Lower PennsylvanianLocation: Beach City Dam outcrop - exposure on the southern side of Sugar Creek, immediately downstream from Beach City Dam, northern Franklin Township, northwestern Tuscarawas County, northeastern Ohio, USA (40° 38’ 06.71” North latitude, 81° 33’ 21.80” West longitude) |
| 撮影日 | 2015-10-31 17:32:23 |
| 撮影者 | James St. John |
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