File:Rhipocephalus phoenix (pinecone alga) (San Salvador Island, Bahamas) 1 (15861862249).jpg
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Summary
[edit]DescriptionRhipocephalus phoenix (pinecone alga) (San Salvador Island, Bahamas) 1 (15861862249).jpg |
Rhipocephalus phoenix (Ellis & Solander, 1786) - pinecone alga on shallow, aragonitic sandy seafloor. Rhipocephalus is a calcareous green alga - the nested circlets of flattened blades have tiny particles of aragonite (CaCO3 - calcium carbonate). After the alga dies and the soft parts decay away, the aragonitic portions become clay- & silt-sized seafloor sediments. A significant percentage of shallow seafloor and shoreline sediments in the Bahamas is from calcareous algae. Many carbonate petrologists suggest that ancient fine-grained limestones (micritic limestones; micrites) are diagenetically altered deposits of calcareous green algae. The pale green cup-on-a-stalk on the right side of the photo is Acetabularia, the Mermaid's wine-glass alga. The fuzzy whitish-green organism behind & to the left of the pinecone alga at center is Batophora, a dasyclad green alga. Classification of Rhipocephalus: Chlorophyta, Bryopsidales, Udoteaceae Locality: shallow seafloor just west of North Point Peninsula, southeastern Graham's Harbour, northeastern San Salvador Island, eastern Bahamas |
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Date | |||
Source | Rhipocephalus phoenix (pinecone alga) (San Salvador Island, Bahamas) 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@N05/15861862249. 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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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/500 sec (0.002) |
F-number | f/4.5 |
ISO speed rating | 80 |
Date and time of data generation | 09:42, 22 June 2010 |
Lens focal length | 14.303 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 01:23, 18 December 2014 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 09:42, 22 June 2010 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 8.96875 |
APEX aperture | 4.34375 |
APEX exposure bias | 0 |
Maximum land aperture | 4.34375 APEX (f/4.51) |
Metering mode | Pattern |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Night scene |
Supported Flashpix version | 1 |
Image width | 2,928 px |
Image height | 1,868 px |
Date metadata was last modified | 20:23, 17 December 2014 |
IIM version | 2 |