'Oldest human brain' discovered
The team, excavating a York University site, discovered a skull containing a yellow substance which scans showed to be shrunken, but brain-shaped.
Brains consist of fatty tissue which microbes in the soil would absorb, so neurologists believe the find could be some kind of fossilised brain.
The skull was found in an area first farmed more than 2,000 years ago.
More tests will now be done to establish what it is actually made of.
The team from York Archaeological Trust had been commissioned by the university to carry out an exploratory dig at Heslington East, where campus extension work is under way.
The skull was discovered in an area of extensive prehistoric farming landscape of fields, trackways and buildings dating back to at least 300 BC.
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Brains consist of fatty tissue which microbes in the soil would absorb, so neurologists believe the find could be some kind of fossilised brain.
The skull was found in an area first farmed more than 2,000 years ago.
More tests will now be done to establish what it is actually made of.
The team from York Archaeological Trust had been commissioned by the university to carry out an exploratory dig at Heslington East, where campus extension work is under way.
The skull was discovered in an area of extensive prehistoric farming landscape of fields, trackways and buildings dating back to at least 300 BC.