File:Archaeocyathan limestone (Ajax Limestone, Lower Cambrian; Mt. Scott Range, South Australia) 8.jpg
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Summary
editDescriptionArchaeocyathan limestone (Ajax Limestone, Lower Cambrian; Mt. Scott Range, South Australia) 8.jpg |
English: Fossiliferous limestone in the Cambrian of South Australia.
The Ajax Limestone is a Lower Cambrian unit in parts of South Australia that has abundant archaeocyathans, formerly a mystery group of sessile, benthic, filter-feeding organisms that made a calcareous skeleton (Phylum Archaeocyatha). These fossils are now known to be an extinct group of sponges (Phylum Porifera). Except for one Upper Cambrian occurrence in Antarctica, archaeocyathans are only known from the Lower Cambrian. The classic localities for these fossils are Siberia and Australia. The Ajax archaeocyathan fauna is quite diverse, with over two dozen species (Taylor, 1910). Stratigraphy: Ajax Limestone, Atdabanian and Botomian Stages, Lower Cambrian Locality: ridge-hilltop outcrop south of Aroona Creek, Mt. Scott Range, west of the town of Leigh Creek, South Australia (vicinity of 30° 35.956’ South latitude, 138° 20.426’ East longitude) Reference cited: Taylor, T.G. 1910. The Archaeocyathinae from the Cambrian of South Australia with an account of the morphology and affinities of the whole class. Memoirs of the Royal Society of South Australia 2(2): 55-188, 16 pls. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/50810032882/ |
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@N05/50810032882. It was reviewed on 7 January 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
7 January 2021
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current | 17:40, 7 January 2021 | 3,008 × 2,000 (5.54 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50810032882/ with UploadWizard |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/125 sec (0.008) |
F-number | f/9 |
ISO speed rating | 200 |
Date and time of data generation | 22:03, 20 August 2006 |
Lens focal length | 70 mm |
Width | 3,008 px |
Height | 2,000 px |
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Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 18.0 (Macintosh) |
File change date and time | 05:01, 7 January 2021 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 22:03, 20 August 2006 |
Meaning of each component |
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APEX shutter speed | 6.965784 |
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APEX exposure bias | 0 |
Maximum land aperture | 4.3 APEX (f/4.44) |
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Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 105 mm |
Scene capture type | Landscape |
Scene control | None |
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Sharpness | Hard |
Subject distance range | Unknown |
Serial number of camera | 1004a0cc |
Lens used | 18.0-70.0 mm f/3.5-4.5 |
Date metadata was last modified | 00:01, 7 January 2021 |
Unique ID of original document | AC448649EEFD3E1AF1D1DD2C39070257 |
IIM version | 18,755 |