Platform extent and radiocarbon sample sites were located on the map. The data were then broken up into seven bins, which were correlated to seven stretches of coast that were subdivided based on orientation. By using this method the true slope of the terraces was determined and error induced by changes in the coastline were sharply reduced, allowing tighter control over definition of the terraces. Since almost all of the terraces are no more than 5 meters wide, the data collected at the outer edge was considered to be inner edge, and the corrections of outer edge to inner edge elevation are small enough to be ignored. Terrace heights and slopes were compared with radiocarbon dates so that average uplift and tilt rates could be determined.
Uplift rates are less at the ends of the exposed terraces.
The dates were obtained from pholadid shells, which lived when the terrace was still submerged, and from shell fragments in marine sand that overlies the terraces and could be younger than the terraces. Rates of rotation varied between terraces and between locations on an individual terrace. Since the bedrock was not closely examined during the survey process, many faults observed in the field were not included in the survey data, so it is unclear if there are faults associated with most of the major changes in platform attitude. The actual number of terraces present is open to some interpretation. Different ages on the same terrace could also be the result of uneven uplift.