Brachiopod fossils (Vinton Member, Logan Formation, Lower Mississippian; Mohawk Dam roadcut, northwest of Nellie, Ohio, USA) : 無料・フリー素材/写真
Brachiopod fossils (Vinton Member, Logan Formation, Lower Mississippian; Mohawk Dam roadcut, northwest of Nellie, Ohio, USA) / 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 | Brachiopod fossils in sandstone in the Mississippian of Ohio, USA.The Vinton Member is the uppermost of four stratigraphic units in the Mississippian-aged, siliciclastics-dominated Logan Formation of eastern Ohio. Ascending from the base, they are the Berne Conglomerate Member, the Byer Sandstone Member, the Allensville Member, and the Vinton Member. The Vinton is dominated by sandstones, siltstones, and shales deposited in a relatively shallow marine facies.The fossil shells seen above are brachiopods, which are sessile, benthic, filter-feeding, marine invertebrates. They first appear in Cambrian rocks and were abundant in Earth's oceans throughout the Paleozoic. They were also common in Mesozoic oceans, but are scarce in modern oceanic biotas. Brachiopods have two shells, called valves, that are usually calcareous (made of calcite - CaCO3 - calcium carbonate). Each shell of a brachiopod is bilaterally symmetrical, unlike each shell of a bivalve (clam).The reddish-brown host material around the fossils is ferruginous sandstone. The surrounding grayish-colored rock is quartzose sandstone.Stratigraphy: Vinton Member, upper Logan Formation, Osagean Stage, upper Lower MississippianLocality: Mohawk Dam roadcut, northwest of the town of Nellie, western Coshocton County, eastern Ohio, USA (vicinity of 40º 21' 10.10" North latitude, 82º 05' 09.12" West longitude) |
| 撮影日 | 2017-02-19 15:50:20 |
| 撮影者 | James St. John |
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