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. In this contribution we describe planktonic assemblages, comprising their taxonomic composition and palaeoecological attributes, from the La Colonia Formation, Patagonia, Argentina. The palynological samples are from the section exposed at Estancia San Miguel, in the Telsen area, Chubut province. Diverse organic-walled remains of Chlorophyta and Charophyta taxa are documented. These include coenobia of two species of Pseudopediastrum , colonies of Botryococcus and zygospores of the form-genus Ovoidites (resembling extant genera of Zygnemataceae). The green algae together with dinoflagellate cysts (analyzed in a previous detailed study) indicate brackish to freshwater and freshwater depositional conditions for the middle and upper part of the Estancia San Miguel section, respectively. These water bodies developed along a coastal plain in the northern Patagonia probably during the Paleocene, in a phase of the extensive first transgressive event of the South Atlantic. The earliest record of Pseudopediastrum brevicorne for Patagonia is presented. KEYWORDS. Organic-walled algae. Palaeoecology. Fresh/brackish water. Maastrichtian–?Paleocene. Patagonia Resumen. ANTIGUOS AMBIENTES COSTEROS EN UNA LINEA DE COSTA ATLANTICA DEL MAASTRICHTIANO– ?PALEOCENO: UN ENFOQUE DESDE EL FITOPLANCTON. En esta contribucion se presentan asociaciones planctonicas, incluyendo sus aspectos taxonomicos y atributos paleoecologicos, de la Formacion La Colonia, Patagonia, Argentina. Las muestras palinologicas estudiadas provienen de la seccion expuesta en Estancia San Miguel, area de Telsen, provincia de Chubut. Se documentan diversos elementos de pared organica de taxones de Chlorophyta y Charophyta. Estos incluyen cenobios de dos especies de Pseudopediastrum , colonias de Botryococcus y cigosporas del morfogenero Ovoidites (similares a cigosporas de generos actuales de Zygnemataceae). Las algas verdes junto a los quistes de dinoflagelados (presentados en un detallado estudio previo) indican condiciones depositacionales de agua salobre a dulce para la parte media y de agua dulce para la parte superior de la seccion Estancia San Miguel. Estos cuerpos de agua se desarrollaron a lo largo de una planicie costera en el norte de Patagonia, posiblemente durante el Paleoceno, en una fase del extensivo primer evento transgresivo del Atlantico Sud. Se presenta el registro mas temprano de Pseudopediastrum brevicorne para Patagonia. PALABRAS CLAVE. Algas de pared organica. Paleoecologia. Agua dulce/salobre. Maastrichtiano–?Paleoceno. Patagonia

ANCIENT COASTAL ENVIRONMENTS IN A MAASTRICHTIAN - ?PALEOCENE ATLANTIC SHORELINE: A PHYTOPLANKTON APPROACH