File:Busycon carica fossil knobbed whelk snail shell (Pleistocene; Lee Creek Mine, Aurora, eastern North Carolina, USA) 1 (15043731570).jpg
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[edit]DescriptionBusycon carica fossil knobbed whelk snail shell (Pleistocene; Lee Creek Mine, Aurora, eastern North Carolina, USA) 1 (15043731570).jpg |
Busycon carica (Gmelin, 1791) fossil knobbed whelk shell (abapertural view) from the Pleistocene of North Carolina, USA. (11 cm tall) Of all the molluscs, the gastropods (snails) 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 often 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, Neogastropoda, Muricoidea, Melongenidae Age: Pleistocene Locality: Lee Creek Mine, Aurora, eastern North Carolina, USA |
Date | |
Source | Busycon carica fossil knobbed whelk snail shell (Pleistocene; Lee Creek Mine, Aurora, eastern North Carolina, USA) 1 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15043731570. It was reviewed on 3 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
3 May 2015
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current | 21:50, 3 May 2015 | ![]() | 1,560 × 2,828 (881 KB) | Natuur12 (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 20:58, 13 September 2014 |
Color space | Uncalibrated |
Image width | 1,560 px |
Image height | 2,828 px |
Date and time of digitizing | 09:54, 2 March 2007 |
Date metadata was last modified | 16:58, 13 September 2014 |
IIM version | 2 |