Fascinating. As a lifelong collector of fossils I recognise it's significance, but have to say I find Trilobites a little more, well, interesting. And the earliest are nearly as old - 520-540 million years.
I have some like these - incredible variety and the extraction techniques are so far ahead of where they were when I first started collecting as a two year old boy. It takes incredible skill with an air pen to do this, and they aren't cheap! I find it astonishing that you can even see the texture of the primitive eyes in someting so ancient.
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