Detailed boring records and surface levels, combined with knowledge gained in a previous study, allow the production of a computer-generated contour map and isometric drawings of the microtopography of the area around Clark's Star Carr site. The occupation area was at the point where open water was closest to the shore, and extended from the marginal wetland on to a dry hillock. The environmental changes are reconstructed from 9800 BP through the occupation period at about 9600 BP to cessation by 9300 BP.