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  1. Hi all, I am going through the latest finds from our trip to the upper cambrian Abrigo Formation from south eastern Arizona, and one of the limestone pieces under magnification had some intriguing fossils. The fossils are calcified as are all the trilobites and brachs in the same material from this site, and are small spheres about 1mm in size with a hole in one end. My first thought was some sort of protist, but my micro paleontology friend suggested they might be tiny round sponges. I have lots of photos to share with you on these enigmatic fossils. What do you think? 7x view of a gaggle of them on the limestone: And a series of 40x close ups of individuals: Microsponges or non fossils?
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