A pollen diagram has been constructed from core taken from the Red Maple swamp in the Connecticut Arboretum Natural Area at Connecticut College, New London. The pollen diagram shows a zone of much spruce-pine pollen and high N A P at the lower level followed by a zone dominated by spruce with 2 spruce maxima. This is followed by a zone dominated by pine and then by a zone dominated by deciduous tree pollen. The lowest zone, T-2, suggests a spruce-pine park-tundra type vegetation followed by the T-3 zone, where N A P is most abundant, indicating a dominance of herbaceous and shrubby forms. This latter zone (T-3) represents a most severe climatic interval which is presumed to correlate with the temporary halt of the ice 3 mi. N. of the Red Maple swamp (Ledyard moraine). Within the spruce period 2 spruce maxima are separated by a minimum which represents a time of climatic amelioration correlate with the Two Creeks Interval. The second spruce maximum is correlated with the Valders advance. Well-differentiated stages within the C-zone, typical of most inland diagrams, are lacking. This is probably due to the coastal position of the swamp.