Stromatolite fossil dating
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Our unique hand-made items are intended to be displayed or used.Present-day formations can be seen in the Everglades, Florida, USA, and in Shark Bay, Australia. Keywords: algae, animal, animals, blue-green, cyanobacteria, fossil, fossil invertebrate, fossilised, fossils, invertebrates, messinian fossil, messinian stromatolite, palaeontology, paleontology, stromatolite Licence fees: A licence fee will be charged for any media (low or high resolution) used in your project.This image was taken at El Joyazo, Nijar, Almeria, Spain. Stromatolites are the oldest known fossils, dating back more than 3 billion years.They are colonial structures formed by photosynthesizing cyannobacteria and other microbes.The cyanobacteria make some sticky stuff that captures the calcium carbonate and other minerals.
These minerals form a crust over the cyanobacteria, which continue to grow around and through the crusty layer.
The process forms layer after layer until the classic mushroom shape of the stromatolite raises itself right out of the water.
The remains of these bacteria have created the oldest fossils on earth! This is remarkable by itself but even more so when you consider that the oldest rocks that have been dated are 3.8 billion years old.
Request low-res file 530 pixels on longest edge, unwatermarked Request/Download high-res file Uncompressed file size: 48.2MB Downloadable file size: 5.6MB Price image Please login to use the price calculator Credit: JON WILSON/SCIENCE PHOTO LIBRARY Caption: Messinian stromatolite fossil.
Stromatolites are large, stony, cushion-like masses, composed of numerous layers of fossilised cyanobacteria (blue- green algae), which have been preserved due to their ability to secrete calcium carbonate.
While features of some stromatolites are suggestive of biological activity, others possess features that are more consistent with abiotic (non-biological) precipitation.