The data from the Prague Basin are also difficult to
evaluate because the palynological (acritarchs and chitinozoans) assemblages are clearly impoverished either
due to unfavourable palaeoenvironmental conditions or
to post-diagenetic taphonomic factors; in fact, the
majority of the samples investigated byDufka and
Fatka (1993)were barren, and many samples from the
Kosov Formation were dominated by cryptospores,
strongly indicating a proximal, shallow-water depositional environment unfavourable to phytoplankton production and preservation