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Showing results for tags 'rangeomorph'.
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A rangeomorph holdfast trace fossil from the Ediacara formation, Rawnsley quartzite of the Flinders Range, South Australia. This specimen is Medusina mawsoni, so called because it was until recently thought to be a jellyfish, but is now believed to be the attachment point of a fractal rangeomorph as Charniodiscus is the point of anchorage for Charnia sp. This one may have been the holdfast point for some species of Rangea. The diameter of the outer circle is 1.5 cm and the fossil is estimated to be 555 million years old.
Until recently classified as a jellyfish, Medusina mawsoni is now considered to be the trace where a holdfast where a rangeomorph such as Rangea was connected to the substrate as in Charniodiscus being the base of Charnia. This specimen is thus about 555 million years old and is from the Rawnsley Quartzite.
This is a rangeomorph holdfast from the Ediacaran of the Flinder's Range in Australia. It is labeled as Medusinites mawsoni, as it was believed to have belonged to a jellyfish, but this is now not considered to be true, and is likely similar to Charniodiscus in being the holdfast for a member of the Vendobionta, probably a fractal rangeomorph like Charnia. This is therefore Precambrian in age, somewhere between 550 to 560 million years old or so.
I've been making a series of fossil-formation "lockets". Little trinkets that look like a rock, and which open up to show fossils from the rock formation depicted. This Ediacaran Biota locket is my most complex, and most carefully researched piece to-date. Right now I am considering what to do next... When I do an internet search for "famous fossil formations", the first result is for "Hell Creek". It's kind of tough to fit dinosaurs into these little lockets, but I am thinking I could get the K-Pg boundary plated (probably in Gold, since Iridium doesn't look all that different than pewter). I'd love to hear comments, and suggestions on other formations that would be good to do (I already have Burgess Shale and Solnhofen Limestone).