Encara no tenim significats per a "cretaceous age".
1The geology of this neighborhood was interesting-Oliveirafound fossil tree-trunkswhich he believed to be of cretaceous age.
2Rocks of Upper Cretaceous age are represented in all their stages.
3These are probably of Eocene or of late Cretaceous age.
4A fossil species of this genus of Upper Cretaceous age was named by Bosquet Chthamalus Darwini.