File:Diorama of a Pennsylanian seafloor - Amphicentrum fish, Tainoceras nautiloid, Trigonotreta brachiopods, algae (45642214411).jpg
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Summary
DescriptionDiorama of a Pennsylanian seafloor - Amphicentrum fish, Tainoceras nautiloid, Trigonotreta brachiopods, algae (45642214411).jpg |
Seen here is a model-based reconstruction of life on an ancient seafloor during the Pennsylvanian Period - the "Age of Coal Swamps". This is a public exhibit at the Carnegie Museum of Natural History in Pittsburgh, Pennsylvania. From exhibit signage: Pennsylvania: a Tropical Paradise? Between 286 and 320 million years ago, the Pennsylvanian Period, North America straddled the equator. The Pittsburgh/Tri-State area was a land of tropical forests, beaches, and vast seas. The waters were warm and rich with life. The sea level repeatedly rose and fell, due to plate movement and collisions, periodically covering large parts of North America. The organisms shown above lived in these relatively shallow seas of less than 200 feet deep. The coastal areas teemed with micro-organisms. Distant relatives of today's sponges, corals, bryozoans, crinoids, and molluscs inhabited the bottom along with now exinct trilobites and ammonites, while primitive fishes swam above. Sediments eroded from the young Appalachian Mountains were washed into the shallow seas. There, marine limestones, sandstones, and shales formed, often preserving as fossils the remains of many dead organisms. Also buried were millions of micro-organisms, which through heat and pressure were transformed into the fossil fuels, oil and gas, that serve the world today. The squid in the coiled shell is a Tainoceras nautiloid cephalopod. The fish are palaeoniscoids called Amphicentrum. The greenish, weed-like things are algae. The tapered structures in the upper left background are Caninia rugose corals ("horn corals"). The light brown-colored seashells at lower right are Trigonotreta spiriferid brachiopods. The seashells near the lower left are Aviculopecten scallops (bivalves). |
Date | |
Source | Diorama of a Pennsylanian seafloor - Amphicentrum fish, Tainoceras nautiloid, Trigonotreta brachiopods, algae |
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@N05/45642214411 (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
Items portrayed in this file
depicts
some value
21 July 2006
0.008 second
5.6
46 millimetre
200
image/jpeg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 04:40, 6 November 2018 | 3,008 × 2,000 (4.44 MB) | Lu Brito | Transferred from Flickr via #flickr2commons |
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Metadata
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Exposure time | 1/125 sec (0.008) |
F-number | f/5.6 |
ISO speed rating | 200 |
Date and time of data generation | 11:38, 21 July 2006 |
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Horizontal resolution | 300 dpi |
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Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 21:24, 30 October 2018 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 11:38, 21 July 2006 |
Meaning of each component |
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Shutter speed | 6.965784 |
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File source | Digital still camera |
Scene type | A directly photographed image |
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White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 69 mm |
Scene capture type | Standard |
Scene control | None |
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Date metadata was last modified | 17:24, 30 October 2018 |
Unique ID of original document | 461F8443E03D29A8963ABF506654C5AA |
IIM version | 1 |