File:Dickinsonia costata (Ediacaran fossil) (Ediacara Member, Rawnsley Quartzite, near-uppermost Neoproterozoic; Flinders Ranges, South Australia) 1 (15018192227).jpg

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Dickinsonia costata Sprigg, 1947 in quartzose sandstone from the Precambrian of Australia. (SAM P13750/P40679, South Australian Museum, Adelaide, Australia) (~7.7 cm long)

Soft-bodied macroscopic fossils have long been known from upper Neoproterozoic (Ediacaran) rocks, but they continue to generate much excitement among geologists. Biologic interpretations of Ediacaran organisms have been all over the map. Many Ediacaran fossils appear to be animals, but some paleontologists have interpreted them as lichens or giant protists or members of an extinct kingdom.

One of the quintessential examples of an Ediacaran fossil is Dickinsonia. Prima facie, it appears bilaterally symmetrical, but it does have subtle asymmetry. It has the general appearance of a flattened worm with a stretched pancake body. This Dickinsonia specimen is from the Flinders Ranges of South Australia, one of the world’s classic localities for Ediacaran fossils. As do most Ediacarans, Dickinsonia displays soft-part preservation in a matrix of clean, quartzose sandstone.

Stratigraphy: Ediacara Member, Rawnsley Quartzite, near-uppermost Neoproterozoic

Locality: Flinders Ranges, South Australia
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Source Dickinsonia costata (Ediacaran fossil) (Ediacara Member, Rawnsley Quartzite, near-uppermost Neoproterozoic; Flinders Ranges, South Australia) 1
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@N05/15018192227 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 December 2019

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current02:11, 6 December 2019Thumbnail for version as of 02:11, 6 December 20191,273 × 1,477 (2.08 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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