THE PALYNOLOGY OF THE CERREJON FORMATION (UPPER PALEOCENE) OF NORTHERN COLOMBIA CARLOS A. JARAMILLO1 GUY J. HARRINGTON GERMAN BAYONA School of Geography Smithsonian Tropical Research Institute, Unit 0948 Earth and Environmental Sciences APO AA 34002-0948, U.S A. The University of Birmingham 'corresponding author, e-mail:
[email protected] Birmingham B15 2TT, United Kingdom ANDRES PARDO-TRUJILLO GERMAN MORA Universidad de Caldas Department of Geological and Atmospheric Sciences Facultad de Ciencias Iowa State University Departamento de Ciencias Geologicas Ames, Iowa 50011-321, U.S A. Calle 65, Number 26-10 Manizales, Colombia MILTON RUEDA VLADIMIR TORRES Biostratigraphy Team Colombian Petroleum Institute AA 4185 Bucaramanga, Colombia Abstract A palynological study of the Cerrejon Formation was conducted in order to date the formation and understand the floristic composition and diversity of a Paleocene tropical site. The Cerrejon Formation outcrops in the Cerrejon Coal Mine, the largest open cast coal mine in the world. Two cores (725 m) were provided by Carbones del Cerrejon LLC for study. Two hundred samples were prepared for palynology, and at least 150 palynomorphs were counted per sample where possible. Several statistical techniques including rarefaction, species accumulation curves, detrended correspondence analysis, and Anosim were used to analyze the floristic composition and diversity of the palynofloras. Palynomorph assemblages indicate that the age of the Cerrejon Formation and the overlying Tabaco Formation is Middle to Late Paleocene (ca. 60-58 Ma). Major structural repetitions were not found in the Cerrejon Formation in the Cerrejon coal mine, and there is little floral variation throughout. The floral composition, diversity, and lithofacies do not change significantly.