A palynological and plant macrofossil study of a short core of organic sediment from the floor of the Bristol Channel at –36 m (–120 feet) O.D. is presented and discussed. The fossil assemblages were deposited in a freshwater pond and reedswamp. This sediment, the deepest yet examined for Flandrian pollen in the Bristol Channel, is overlain by what are interpreted as intertidal sediments and indicates the approximate sea level and position of the coastline of South Wales about 9500 years B.P. The open nature of the vegetation in the area around the site of deposition is indicated by the presence of Juniperus pollen. Of the only two tree pollen types present Betula is far more frequent than Pinus, a feature common to the early Flandrian of southwest England and northwest France. The age ascribed to this deep sediment is consistent with other observations on submerged deposits both in the Bristol and English Channels.