Radar Image

The radar image (Fig. 5) has less resolution than the visible images, but because the wavelength is longer, there is penetration of the dry surficial sands. In the radar images, the ring structure appears more continuous than in the visible wavelengths. Even in the radar images, the different rings are separated by areas of low reflectivity. These dark areas could be areas where the sand is thicker (the radar did not penetrate) or where different bedrock materials occur. Presumably the ridges observed in the visible wavelength images represent differentially eroded layers that remain above the surficial sand cover.

Fig. 9. Upturned strata of sandstone on the south side of the inner ring (central uplift) of BP.

Middle Ring

Middle Ring

Outer Ring

Middle Rina

Outer Ring

Middle Rina

Fig. 10 (a top, b bottom). Overview of the three ring structures at BP, as seen from the top of the inner ring (central uplift), looking southeast and east, respectively.

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