Petrified leaf and pericarpic tissues from the Eocene Deccan Intertrappean beds of India were studied using light and transmission electron microscopy. Degradated cytoplasm with organellelike bodies are present in cells of the leaf tissues. TEM of these cells revealed wall structure and cytoplasmic residues. Microfibril distribution of pericarpic cells resembles fiber cells in extant angiosperms.
Nambudiri, E. M. V.; Tidwell, W. D.; and Hess, W. M.
"Ultrastructure of Eocene fossil plants,"
Great Basin Naturalist: Vol. 41
, Article 10.
Available at: https://scholarsarchive.byu.edu/gbn/vol41/iss1/10