Palynological and sequence stratigraphic analysis of the Napo Group in the Pungarayacu

Cristian Vallejo Cruz, Peter Hochuli, Wilfried Winkler, Katharina von Salis

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39 Citations (Scopus)


The study of palynomorphs and calcareous nannofossils from the Albian–Campanian Napo Group in the Pungarayacu 30
well in the Subandean Zone of Ecuador has led to a new biostratigraphic framework revealing the existence of several hiatuses
for this area. The palynological and palynofacies data are used together with other fossils and lithological evidence to define
a sequence stratigraphic framework. The distribution of palynomorphs and palynofacies indicates a strong terrestrial input for
the lower part of the Napo Group (Napo Basal and Lower Napo formations). In the upper part (Middle and Upper Napo
formations), terrestrial input is reduced and a restricted marine environment with several dysoxic–anoxic intervals can be
inferred. The hydrocarbons present in the well studied have traditionally been regarded as locally sourced. However, several
lines of evidence (TAS, Tmax and VR) prove the immature stage of the source rock in this borehole as well as in a larger
Original languageEnglish
Pages (from-to)845-859
JournalCretaceous Research
Publication statusPublished - 2002


  • Napo Group
  • Ecuador
  • Oriente Basin


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