Gastropod fossils (Solsville Shale, Middle Devonian; Morrisville North roadcut, Madison County, New York State, USA) 11 : 無料・フリー素材/写真
Gastropod fossils (Solsville Shale, Middle Devonian; Morrisville North roadcut, Madison County, New York State, USA) 11 / 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 | Gastropods from the Devonian of New York State, USA.These fossils from the Solsville Shale are high-spired snails (gastropods) identified as Palaeozygopleura hamiltoniae (Hall, 1859). Of all the molluscs, the gastropods have made the most ecological adaptations. They can be found in almost all fundamental environments: marine, freshwater, terrestrial. Most gastropods live in the ocean, and have a single, asymmetrically coiled, external shell of calcium carbonate (CaCO3 - usually aragonite). The hard calcareous shell is the most easily fossilized part of the gastropod. The soft parts of a snail (the “slug” portion) include a well developed head having eyes, tentacles, and a mouth, and a well developed, strong, muscular foot used principally for locomotion. The shell is carried upright on the snail’s back, or is partially dragged behind. When threatened by a predator, many snails can retract their soft parts into the shell’s interior for protection. Many fossil snails in the Paleozoic rock record are not well preserved, or are preserved as internal molds. The original aragonite of many gastropod shells is not stable on geologic time scales, and often recrystallizes or dissolves completely away. Fossil snail shells in Mesozoic and Cenozoic rocks are usually better preserved.Classification: Animalia, Mollusca, Gastropoda, PalaeozygopleuridaeStratigraphy: Solsville Shale Member, Marcellus Formation, Middle DevonianLocality: Morrisville North Outcrop - roadcut on the eastern side of Swamp Road, just south of the Gill Road-Swamp Road intersection, north of the town of Morrisville, Madison County, central New York State, USA (42° 56’ 04.82” North latitude, 75° 39’ 47.25” West longitude) |
| 撮影日 | 2012-05-10 15:03:17 |
| 撮影者 | James St. John |
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