It is the world's only human brain fossil, the oldest human brain,
probably bigger and more complex than modern human brain.
It was found inside a calvarium fossil of the Carboniferous age, but
so well preserved that the nuclei of its neurons are clearly seen in
micrographs.
See the brain tissue and neurons at:
http://www.youtube.com/user/LinLiangtai

http://www.wretch.cc/mypage/lin440315

http://www.wretch.cc/video/lin440315

http://www.wretch.cc/album/lin440315