File:Trepostome bryozoan (Grant Lake Formation, Upper Ordovician; south of Excello, Ohio, USA) 2 (49710941711).jpg
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[edit]DescriptionTrepostome bryozoan (Grant Lake Formation, Upper Ordovician; south of Excello, Ohio, USA) 2 (49710941711).jpg |
Bryozoan fossil from the Ordovician of Ohio, USA. This specimen is from the famous Cincinnatian Series of the tristate area of Ohio-Kentucky-Indiana. Rocks in the Cincinnatian were deposited in relatively shallow marine facies during the Late Ordovician. The Cincinnatian succession is mostly interbedded limestones and shales, all richly fossiliferous. Most of the limestones are event beds (= tempestites), deposited during ancient storms. Bryozoans are colonial lophophorates, most of which make a calcareous skeleton. Many bryozoan skeletons have complex shapes that usually cannot be fully appreciated from the fossil record. Bryozoans are abundant fossils, especially in Paleozoic and Mesozoic limestones, but their skeletons usually get busted up during the storm events resulting in their final burial. Colony reconstructions (see elsewhere in the bryozoan photo album) can be time-consuming, especially with large fragmented specimens. Click on the photo to zoom in and look around - notice the numerous pits covering the bryozoan. The pits are zooecia - each zooecium housed an individual bryozoan animal, called a zooid. Zooids have a ring of tentacles that filter the water for tiny particles of food. All bryozoans are sessile, benthic filter-feeders. Classification: Animalia, Bryozoa, Stenolaemata, Trepostomata Stratigraphy: "Grant Lake Formation" (apparently from the Mount Auburn Member), Maysvillian Stage, middle Cincinnatian Series, Upper Ordovician Locality: Excello South outcrop - roadcut on the western side of Route 4, just south of the Route 4-Route 73 intersection, south of the town of Excello, eastern Butler County, southwestern Ohio, USA (39° 28’ 28.84” North latitude, 84° 24’ 29.25” West longitude) |
Date | |
Source | Trepostome bryozoan (Grant Lake Formation, Upper Ordovician; south of Excello, Ohio, USA) 2 |
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@N05/49710941711. It was reviewed on 14 April 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
14 April 2020
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current | 18:10, 14 April 2020 | 2,624 × 2,071 (2.83 MB) | Poldavia (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 | 1/60 sec (0.016666666666667) |
F-number | f/11 |
ISO speed rating | 80 |
Date and time of data generation | 23:42, 28 March 2020 |
Lens focal length | 11.614 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 16.0 (Macintosh) |
File change date and time | 01:58, 29 March 2020 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 23:42, 28 March 2020 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction 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 | 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 | 21:58, 28 March 2020 |
Unique ID of original document | F14832939861A7138CA0ACC986B6342C |