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Paleontologist Matt Friedman was surprised to find a stunningly detailed 319 million-year-old fish brain fossil as he tried the micro-CT scans of broader research.
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"It had all these features, and I said to myself, 'Is this really a brain that I'm looking at?'" says Friedman from University of Michigan.
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"So, I zoomed in on that region of the skull to make a second, higher-resolution scan, and it was very clear that that's exactly what it had to be.
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And it was only because this was such an unambiguous example that we decided to take it further."
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Most of the time, the only remains of the ancient world are found in the more easily preserved animal parts, such as their bones, as soft tissues break down quickly.
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However, in this instance, it was a mineral that was very dense such as pyrite or a similar mineral, sucked into the tissue and replaced it.