File:Mollusc shells on marine beach (Sanibel Inn Beach, Sanibel Island, Florida, USA) 3.jpg
Original file (3,968 × 2,976 pixels, file size: 5.4 MB, MIME type: image/jpeg)
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Summary[edit]
DescriptionMollusc shells on marine beach (Sanibel Inn Beach, Sanibel Island, Florida, USA) 3.jpg |
English: Mollusc shells on a marine beach in Florida, USA (December 2013).
Sanibel Island is one of dozens of barrier islands in the West-Central Florida Barrier Chain. This 191-mile long, slightly sinuous stretch of islands is located along the Gulf of Mexico coast of southern Florida. The southern-most island in the chain is Cape Romano Island. The northern-most islands are the Anclote Keys. Sanibel Island is located between Captiva Island and mainland Florida, just offshore from the towns of Fort Myers and Cape Coral, Florida. Much of Sanibel Island is developed, but significant tracts have been allowed to become wilderness - especially Ding Darling National Wildlife Refuge. Sanibel is on the southern side of Pine Island Sound, a large lagoon just south of Charlotte Harbor. A tidal inlet occurs on the island's western side - Blind Pass (a man-made construct). To the east of Sanibel is a moderately broad waterway - San Carlos Pass. Sanibel Island and nearby Captiva Island, North Captiva Island, and Cayo Costa Island are Holocene barriers that rim the southern and western sides of a Late Miocene depression that is now Pine Island Sound. Middle Miocene limestone bedrock was subject to significant dissolution and karst/cave development. The Pine Island Sound area was a large karst depression in the Late Miocene. It is now filled with sediments - most of modern Pine Island Sound is significantly shallow. Sanibel is famous for its shell-rich marine beaches. The Sanibel Island area has the 3rd-richest seashell beaches on Earth and the # 1 richest shell beaches in the Western Hemisphere. Shell collecting is best after a storm. The beach shown above is Algiers Beach, which is part of Gulfside City Park on the southern shoreline of Sanibel Island. About 99% of the shells on Sanibel Island beaches are bivalves (clams). Relatively few snails (gastropods) are present, but they are more common and conspicuous after storm events. Other marine remains observed on these beaches include sea urchins (echinoids), starfish (asteroids), crabs (decapods), horseshoe crabs (xiphosurans), sponges (poriferans), stony corals (anthozoan cnidarians), sea squirts (tunicates), sea hares (anaspidean opisthobranch gastropods), worm tubes, fish & fish skeletons, and stingray barbs. In the above photo, most of the shells are ark clams (Family Arcidae) and Chione cross-barred venus clams (Family Veneridae). I also recognize scallops (Family Pectinidae), Donax coquina clams (Family Donacidae), kitten's paws (Family Plicatulidae), and a mother-of-pearl iridescent fragment of a pen shell (Family Pinnidae). Locality: marine beach immediately south of Sanibel Inn, southern shoreline of Sanibel Island, southwestern Florida, USA West-Central Florida Barrier Chain geologic info. synthesized from: Evans et al. (1985) - Bedrock controls on barrier island development: west-central Florida coast. Marine Geology 63: 263-283. Davis (1989) - Morphodynamics of the West-Central Florida barrier system: the delicate balance between wave- and tide-domination. Proceedings, Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap Symposium, 'Coastal Lowlands, Geology and Geotechnology', 1987: 225-235. Evans et al. (1989) - Quaternary stratigraphy of the Charlotte Harbor estuarine-lagoon system, southwest Florida: implications of the carbonate-siliciclastic transition. Marine Geology 88: 319-348. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/25212545594/ |
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@N05/25212545594 (archive). It was reviewed on 5 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
5 March 2020
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current | 18:22, 5 March 2020 | 3,968 × 2,976 (5.4 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/25212545594/ with UploadWizard |
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Camera manufacturer | OLYMPUS IMAGING CORP. |
Camera model | TG-1 |
Exposure time | 1/250 sec (0.004) |
F-number | f/4.5 |
ISO speed rating | 100 |
Date and time of data generation | 10:08, 15 December 2013 |
Lens focal length | 8.41 mm |
Width | 3,968 px |
Height | 2,976 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 314 dpi |
Vertical resolution | 314 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 17:13, 16 March 2016 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.3 |
Date and time of digitizing | 10:08, 15 December 2013 |
Meaning of each component |
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APEX shutter speed | 7.965784 |
APEX aperture | 4.33985 |
APEX exposure bias | 0 |
Maximum land aperture | 2 APEX (f/2) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 46 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Receiver status | Measurement interoperability |
Reference for direction of image | Magnetic direction |
Direction of image | 331 |
GPS tag version | 0.0.3.2 |
Serial number of camera | BCA539215 |
Date metadata was last modified | 11:13, 16 March 2016 |
Unique ID of original document | 7BCF67BB3D758C44B45E62352ADC4B78 |