On somelocal restricted Maastrichtian environments of the "Hateg island" (Transylvania, Romania)

Περίληψη

The continental Maastrichtian formations from Transylvania are notorious mainly for bearing peculiar fossils related to an island realm known as the "Ha.eg Island". The thick piles of sedimentary rocks accumulated in fluvial environments. The "red beds" are in dominance. However, local peculiar environments are of interest for specific types of fossilization (plants, invertebrates or vertebrates), i.e. ox-bow lakes or fluvial temporary abandoned channels. In such deposits the fossil record can be different compared to the red beds, especially when the oxygen content was low. Case studies as the ones from Pui (Ha.eg Basin) or Oarda de Jos (SW Transylvanian Basin) are exposed. The relationships of fossil taxa and these restricted environments are discussed.