File:Archaeocyathan limestone (Fork Tree Limestone, Lower Cambrian; Old Sellicks Hill Road, Fleurieu Peninsula, South Australia) 2.jpg
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| Description |
English: Archaeocyathan limestone in the Cambrian of South Australia.
This limestone outcrop is in South Australia's Fork Tree Limestone (Lower Cambrian). The unit has archaeocyathan fossils (= irregularly rounded/ovoid structures), which were described in 1990 (Debrenne & Gravestock. 1990. Archaeocyatha from the Sellick Hills Formation and Fork Tree Limestone on Fleurieu Peninsula, South Australia. Geological Society of South Australia Special Publication 16: 290-309.) Archaeocyathans were sessile, benthic filter-feeding invertebrates that made a double-walled, calcareous skeleton. They are now considered to be an odd group of sponges. They formed bioherms (reefs) and are significant guide fossils in Lower Cambrian rocks. Classification: Animalia, Porifera, Archaeocyatha Stratigraphy: near the base of the Fork Tree Limestone, Normanville Group, lower Botomian Stage, middle Lower Cambrian Locality: hillside exposure along Old Sellicks Hill Road, south-southeast of the town of Sellicks Hill, northern Fleurieu Peninsula, southeastern South Australia (vicinity of 35° 20.071' South latitude, 138° 28.703' East longitude) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/49955498713/ |
| 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@N05/49955498713. It was reviewed on 13 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 00:25, 13 October 2020 | | 3,008 × 2,000 (5.78 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49955498713/ with UploadWizard |
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