File:Pentremites sp. (fossil blastoid) (Raney Creek Member, Slade Formation, Upper Mississippian; Bighill Mountain roadcut, south of Bighill, Kentucky, USA) 1 (43924000000).jpg
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editDescriptionPentremites sp. (fossil blastoid) (Raney Creek Member, Slade Formation, Upper Mississippian; Bighill Mountain roadcut, south of Bighill, Kentucky, USA) 1 (43924000000).jpg |
Pentremites sp. - fossil blastoid head in the Mississippian of Kentucky, USA. Blastoids are an extinct group of echinoderms. They resemble crinoids in having a head, or theca, perched atop a long stem of stacked columnals composed of calcite. Crinoids and blastoids are pelmatozoans - stalked echinoderms. Both groups are sessile, benthic, filter-feeding organisms. The overall structure and morphology of crinoid heads and blastoid heads are quite different. Blastoid heads have pentaradial symmetry and somewhat resemble closed flower buds or nuts. They have five ambulacral grooves extending outward and downward from the summit of the theca. During life, many thin, delicate brachioles extended from the ambulacral grooves - these structures captured tiny particles of food from seawater as the blastoid engaged in filter feeding. Classification: Animalia, Echinodermata, Blastozoa, Blastoidea, Spiraculata, Pentremitidae Stratigraphy: Raney Creek Member, Slade Formation, Chesterian Series, Upper Mississippian Locality: Bighill Mountain Outcrop - Route 421 roadcut through Bighill Mountain, ~county line between Rockcastle County and Madison County, south of the town of Bighill, east-central Kentucky, USA (vicinity of 37° 31’ 24.89” North latitude, 84° 12’ 28.15” West longitude) More info. at: <a href="https://en.wikipedia.org/wiki/Blastoid" rel="nofollow">en.wikipedia.org/wiki/Blastoid</a> |
Date | |
Source | Pentremites sp. (fossil blastoid) (Raney Creek Member, Slade Formation, Upper Mississippian; Bighill Mountain roadcut, south of Bighill, Kentucky, USA) 1 |
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@N05/43924000000 (archive). It was reviewed on 6 November 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
6 November 2018
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current | 04:10, 6 November 2018 | 2,360 × 1,586 (2.57 MB) | Lu Brito (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 | 1/100 sec (0.01) |
F-number | f/2.8 |
ISO speed rating | 80 |
Date and time of data generation | 13:18, 12 March 2018 |
Lens focal length | 6.2 mm |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 20:31, 5 November 2018 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 13:18, 12 March 2018 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 6.65625 |
APEX aperture | 2.96875 |
APEX exposure bias | −1 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Pattern |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
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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 | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 15:31, 5 November 2018 |
Unique ID of original document | 68A8469457E6714067F77F620C1166D3 |
IIM version | 29,735 |