File:Mollusc shells on marine beach (Cayo Costa Island, Florida, USA) 16 (25574883763).jpg
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Summary
editDescriptionMollusc shells on marine beach (Cayo Costa Island, Florida, USA) 16 (25574883763).jpg |
Mollusc shells on a marine beach at the southern tip of Cayo Costa Island, Florida, USA (December 2013). Cayo Costa 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. Cayo Costa Island is located between North Captiva Island and Gasparilla Island, offshore from the towns of Fort Myers and Cape Coral, Florida. Most of Cayo Costa Island is a state park and is only accessible by boat. Cayo Costa is on the western side of Pine Island Sound, a large lagoon just south of Charlotte Harbor. Two large tidal inlets border Cayo Costa Island - Captiva Pass to the south and Boca Grande Pass to the north. Cayo Costa is a classic example of a drumstick barrier island - it is wide on its northern end and tapers to a point or hook on its southern end. This shape is the result of long-shore currents along the coastline. Other islands in the barrier chain also have this morphology. Cayo Costa Island and nearby North Captiva Island, Captiva Island, and Sanibel Island are Holocene barriers that rim the western and southern 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. The beaches of Cayo Costa Island are famous for having an abundance of shells - they form moderately thick piles along much of the island's shoreline. The relative abundance and quality of shells varies from site to site and with weather & seasonal conditions. The shells shown above are 99% bivalves, but gastropods, echinoids, and other organisms are also present. 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 | Mollusc shells on marine beach (Cayo Costa Island, Florida, USA) 16 |
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@N05/25574883763. It was reviewed on 14 August 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
14 August 2016
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current | 17:27, 14 August 2016 | 3,968 × 2,765 (4.25 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
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Camera manufacturer | OLYMPUS IMAGING CORP. |
Camera model | TG-1 |
Exposure time | 1/400 sec (0.0025) |
F-number | f/11 |
ISO speed rating | 100 |
Date and time of data generation | 10:34, 16 December 2013 |
Lens focal length | 7.34 mm |
Latitude | 26° 36′ 50.87″ N |
Longitude | 82° 13′ 22.64″ W |
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 | 18:35, 1 April 2016 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.3 |
Date and time of digitizing | 10:34, 16 December 2013 |
Meaning of each component |
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APEX shutter speed | 8.643856 |
APEX aperture | 6.918863 |
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 | 40 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Receiver status | Measurement in progress |
Reference for direction of image | Magnetic direction |
Direction of image | 246 |
Name of GPS area | Captiva Island Golf Club |
GPS tag version | 0.0.3.2 |
Serial number of camera | BCA539215 |
Date metadata was last modified | 12:35, 1 April 2016 |
Unique ID of original document | 69C556EC68655A7B79F005AC5336D5A5 |