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Campanian to Paleocene dinoflagellate cyst biostratigraphy from offshore sediments in the Tano basin, southwestern Ghana


, : Campanian to Paleocene dinoflagellate cyst biostratigraphy from offshore sediments in the Tano basin, southwestern Ghana. Revista Espanola de Micropaleontologia. Mayo-Agosto; 362: 305-321

Dinoflagellate cysts have been recovered and studied from sediments between intervals 6,440 ft (1,932 m)-600 ft (180 m) in well 1S-3AX, offshore Tano basin. The dinoflagellate assemblage is abundant, diverse and well preserved. Three biozones (Trichodinium castanea, Cordosphaeridium 'complex', and Carpatella cornuta Zones) have been identified based on the First Appearance Datum (FAD) and Last Appearance Datum (LAD) of important species. Biostratigraphically significant taxa found in the assemblages allowed the identification of Early to Late Campanian, Early to Late Maastrichtian and Early Paleocene age for the biozones respectively. Vertical distribution of dinoflagellate assemblages upwards in the well suggests a near shore or brackish environment of deposition for the Campanian sediments, and an open marine environment for the Maastrichtian and Paleocene sediments. The peridiniacean assemblage (Andalusiella, Cerodinium, Phelodinium, Senegalinium) is assigned to the tropical-subtropical Malloy suite of Lentin and Williams (1980).

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