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Showing results for tags 'ptychopariida'.
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.
Hi, all. I found this specimen last summer near a clay quarry in Rogers City, Michigan. I think there might be two trilobite fossils here. The one on the lower left looks like it could be from the order Ptychopariida, and there may also be the segmented thorax of another trilobite. What are your thoughts