File:Silicified stromatolite (Strelley Pool Formation, Paleoarchean, 3.35-3.46 Ga; East Strelley Greenstone Belt, Pilbara Craton, Western Australia) (15177778617).jpg

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Captions

Captions

Stromatolite banding patterns from the Strelley Pool Formation in Western Australia

Summary

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Description

Faulted, silicified stromatolite (cut & polished slice, 10.5 cm across at its widest) from the Precambrian of Australia.

This is a sample from the oldest known definite fossil occurrence on Planet Earth. This is a faulted, chertified stromatolite from the Paleoarchean of Western Australia.

Stromatolites are large, layered structures built up by mats of cyanobacteria. They vary in appearance, ranging from slightly wrinkled horizontal laminations in sedimentary rocks to low mounds to prominent mounds to columnar structures and other forms. Stromatolites are most common in the Proterozoic fossil record. They are scarce today, but famous modern examples occur at Shark Bay, Western Australia. The oldest known examples are ~3.5 billion years old, from Western Australia - this is a specimen from that occurrence.

Stratigraphy & age: stromatolitic-chert member, Strelley Pool Formation, middle to lower Paleoarchean, 3.35 to 3.46 Ga

Locality: East Strelley Greenstone Belt, Pilbara Craton, Western Australia
Date
Source Silicified stromatolite (Strelley Pool Formation, Paleoarchean, 3.35-3.46 Ga; East Strelley Greenstone Belt, Pilbara Craton, Western Australia)
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15177778617. It was reviewed on 3 March 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

3 March 2015

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current18:22, 3 March 2015Thumbnail for version as of 18:22, 3 March 20151,353 × 1,242 (1.74 MB)Jacopo Werther (talk | contribs)Transferred from Flickr via Flickr2Commons

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