the tough tissues surrounding the actual brain -- as well as tiny capillaries and portions of adjacent cortical tissues have been preserved as mineralised 'ghosts'. What is the meaning of 'ghosts' here ?
1 Answer
https://www.merriam-webster.com/dictionary/ghost
Look at definition 4.a: "a faint shadowy trace."
The way a person leaves behind a ghost, the dinosaur's brain tissue left behind a fossil.
