File:Fossil red algae (Salem Limestone, Middle Mississippian; Elizabethtown, Kentucky, USA) (45624979264).jpg
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DescriptionFossil red algae (Salem Limestone, Middle Mississippian; Elizabethtown, Kentucky, USA) (45624979264).jpg |
Fossil red algae from the Mississippian of Kentucky, USA. The squiggly carbonized compressions in this rock have been interpreted as fossil rhodophytes - red algae. Rhodophytes are the most common of all marine macroalgae, but they often go unnoticed due to the dull coloration and nondescript growth forms of many species. Over 7,000 species are currently known. Despite the common name "red algae", colors include red, pink, whitish, lavender, purple, yellow, and brownish-red. Many rhodophytes are calcareous - they have hard parts of CaCO3, usually as branching forms or crusts. As such, they are important reef organisms, and contribute large amounts of biogenous CaCO3 grains to seafloor sediments. Fleshy red algae are mostly weed-like or mossy or fuzzy. Classification: Plantae, Rhodophyta Stratigraphy: Salem Limestone, Middle Mississippian Locality: unrecorded/undisclosed site at or near Elizabethtown, Kentucky, USA |
Date | |
Source | Fossil red algae (Salem Limestone, Middle Mississippian; Elizabethtown, Kentucky, USA) |
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@N05/45624979264 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
7 December 2019
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current | 18:33, 7 December 2019 | 2,864 × 2,095 (7.43 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/125 sec (0.008) |
F-number | f/4.9 |
ISO speed rating | 320 |
Date and time of data generation | 11:03, 3 May 2012 |
Lens focal length | 18.6 mm |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 23:06, 16 December 2018 |
Exif version | 2.21 |
Date and time of digitizing | 11:03, 3 May 2012 |
APEX shutter speed | 6.9657842861166 |
APEX aperture | 4.5855635130041 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 4.5855635130041 APEX (f/4.9) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905405405 |
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 | 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 | 18:06, 16 December 2018 |
Unique ID of original document | 1650FD727FBDE57B8C5A6B1924B6C4D1 |