The palynological study of 71 core samples from the Boscán Field was performed. The main purposes of this study were the dating and the biostratigraphic and paleoecological characterization of the sedimentary sequences under study.

The palynological assemblage was determined to be Middle Eocene in age, according to the recent zonation published by Muller et al. (1985). In general, sedimentological and palynological results indicte enviromental changes whitin a deltaic complex existing at the time of deposition. An approximate biozonation, based on the results of the cluster analysis and the fluctuations of the relative abundances of the different groups of palynomorphs, indicates a transition from a low deltaic plain to an upper deltaic plain in the 3 subsurface sections under study. A mixed plant community, with coastal and mixed-swamp vegetational components, is inferred to have been present at the time of deposition.

__________

¹ Universidad de Michigan, Departamento de Ciencias Geológicas, 1986.