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Showing results for tags 'ethmocyathus'.
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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.
About 515 million years old, this archaeocyathid shows excellent specimens with both lateral and vertical sections. The internal septa separating the internal wall from the external wall can clearly be seen and the central cavity. Archaeocyatha