Fall into swamp probably helped preserve tissue
SALT LAKE CITY — Dinosaur smarts may be a mystery, but their brains, at least, are now more concrete.
A chunk of petrified brain tissue discovered in a tidal pool in southern England is the first reported from a dinosaur, researchers claim.
The roughly 133-million-year-old fossil preserves the brain’s wrinkled topology, said paleontologist David Norman, who presented the find October 27 at the annual meeting of the Society of Vertebrate Paleontology.
“There are pits and creases and folds,” said Norman, of the University of Cambridge. “It’s a little bit like your bed when you wake up in the morning — somewhat crinkled and folded.”
The fossil, a roughly palm-sized rock, includes bits of bone and the tough outer layers of the brain. A microscopic analysis revealed the brain’s plumbing: Tiny, branching tubes — blood vessels — crisscross the fossil’s surface and penetrate what was once brain tissue.
A beachcombing fossil collector found the specimen in 2004. It probably belonged to an herbivorous dinosaur, perhaps Barilium or Hypselospinus, with a body about the length of a Volkswagen Beetle.
Soft tissue is unusual in the fossil record, Norman said. The dinosaur probably tipped head first into a boggy swamp, where acidic water “literally pickled” the brain, he said. Later, minerals would have petrified the pickled tissue.
The resulting fossil doesn’t offer insight into “the mind of dinosaurs,” Norman said, but it does provide “remarkable preservation” of a piece of the brain itself.
Details of the fossil are also described online October 27 in a special publication of the Geological Society of London.
D. Norman et al. Remarkable preservation of brain tissues in an early Cretaceous iguanodontian dinosaur. Society of Vertebrate Paleontology annual meeting, Salt Lake City, October 27, 2016.
M. Brasier et al. Remarkable preservation of brain tissues in an early Cretaceous iguanodontian dinosaur. Geological Society, London, Special Publications. Published online October 27, 2016. doi: 10.1144/SP448.3.
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