The broader line spacing of the UN data over the sediment-covered Coastal Basin compared to the new data is apparent in the broad wavelengths of the anomalies (Fig. 27). The positive anomalies most likely relate to Cretaceous dikes and perhaps unknown older basement (NE-trending high in SE portion of map). Calculated depths to the top of magnetic basement (Fig. 33) are not well determined because of broad line spacing and uncertain flight height, but range from ~350 in the north east- >4000 m at the western edge of the map.
