File:Busycon carica fossil knobbed whelk snail shell (Pleistocene; Lee Creek Mine, Aurora, North Carolina, USA) 4 (31937146076).jpg
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DescriptionBusycon carica fossil knobbed whelk snail shell (Pleistocene; Lee Creek Mine, Aurora, North Carolina, USA) 4 (31937146076).jpg |
Busycon carica (Gmelin, 1791) - fossil knobbed whelk shell (apertural view) from the Pleistocene of North Carolina, USA. (19 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, North Carolina, USA) 4 |
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@N05/31937146076 (archive). It was reviewed on 2 December 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 December 2018
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current | 07:44, 2 December 2018 | 1,985 × 3,130 (4.2 MB) | Rudolphous (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Date and time of data generation | 21:37, 29 December 2016 |
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Image title | |
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Horizontal resolution | 180 dpi |
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Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 00:55, 30 December 2016 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 21:37, 29 December 2016 |
Meaning of each component |
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File source | Digital still camera |
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Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 19:55, 29 December 2016 |
Unique ID of original document | DC1B761FE1BAA3DA888C01F2364AA876 |