File:Fossil mound in limestone (Champlain Black Marble) (Crown Point Limestone, Middle Ordovician; Vermont, USA) 2.jpg
![File:Fossil mound in limestone (Champlain Black Marble) (Crown Point Limestone, Middle Ordovician; Vermont, USA) 2.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/44/Fossil_mound_in_limestone_%28Champlain_Black_Marble%29_%28Crown_Point_Limestone%2C_Middle_Ordovician%3B_Vermont%2C_USA%29_2.jpg/716px-Fossil_mound_in_limestone_%28Champlain_Black_Marble%29_%28Crown_Point_Limestone%2C_Middle_Ordovician%3B_Vermont%2C_USA%29_2.jpg?20200312011002)
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Summary[edit]
DescriptionFossil mound in limestone (Champlain Black Marble) (Crown Point Limestone, Middle Ordovician; Vermont, USA) 2.jpg |
English: "Champlain Black Marble" - fossiliferous limestone from the Ordovician of Vermont, USA.
In the commercial decorative stone trade, “marble” is used to refer to a wide variety of relatively soft rocks (H = 3 to 5) that will take a fine polish. These include true marbles and rocks that aren’t marbles, such as limestones, tectonic breccias, and serpentinites. True limestones are calcitic biogenic and ~chemical sedimentary rocks. The black material shown above is called "Champlain Black Marble", but is really Ordovician-aged limestone of the Crown Point Limestone. Decent-sized fossils are commonly encountered in this rock, such as gastropods, cephalopods, and bryozoan colonies. The gray-colored, irregularly-layered structure in the polished limestone tile seen here is a fossil mound ("reef"). Crown Point Limestone fossil mounds can be composed of various organisms, such as bryozoans, stromatoporoid sponges, and stromatolites (= layered bacterial structures). Stratigraphy: Crown Point Limestone, lower Middle Ordovician Provenance: attributed to a quarry in Vermont, USA (possibly from the Fisk Quarry or the Goodsell Quarry) Locality: floor paving stone in the Ohio Statehouse, downtown Columbus, Ohio, USA |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/41787123132/ |
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@N05/41787123132. It was reviewed on 12 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
12 March 2020
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current | 01:10, 12 March 2020 | ![]() | 3,287 × 2,753 (6.75 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/41787123132/ with UploadWizard |
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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/8 |
ISO speed rating | 100 |
Date and time of data generation | 10:49, 28 April 2018 |
Lens focal length | 6.2 mm |
Image title | |
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 | 12:13, 1 May 2018 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 10:49, 28 April 2018 |
Meaning of each component |
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APEX shutter speed | 5.90625 |
APEX aperture | 6 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
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 | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 08:13, 1 May 2018 |
Unique ID of original document | D2AA98A2377C6D7268AE899562D3933E |