U.S. rover Spirit, now studying Bonneville crater, discovered the unusual long drifts.
One of the closest to the car such formations called "Snake" (Serpent). This dune and became the new Mars rover to at least one nearest day.
Judging from the first to the spectrometer, the material in the crater is slightly different from the soil, which was studied earlier.
For example, there is a strange thing — the dark areas at the bottom of the crater along the spectrum closer to the previously studied boulders rather than soils. It is not clear from what made dunes and are they the same inside and outside.
Spirit in the next few hours razroet the wheel of the dunes area and will explore her "guts".
Future plans for the mission will be adjusted depending on the results of this study.