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This paper presents the first account of palynomorphs (chitinozoans) from the eastern outcrop belt of the Parnaiba Basin. The chitinozoans are obtained from shallow well core samples, penetrating the Pimenteira Formation, and indicate a late Eifelian – early Givetian age span for this stratigraphic unit, suggesting the absence of a 3rd order unconformity. On the other hand, six minor forced regression unconformities (4th/5th order) occur in the Pimenteira Formation (sequences C-H by Young & Borghi, 2006). A major transgression, initiated in the late Eifelian, reached its maximum in the earliest Givetian, as evidenced by a Maximum Flooding Surface in Sequence D. The investigated sequences are also of interest for the hydrocarbon exploration of the basin, since the sediments include both source-rocks and reservoirs.

Middle Devonian chitinozoan biostratigraphy and sedimentology in the eastern outcrop belt of the Parnaíba Basin, northeastern Brazil