Polar wandering on Mars.

Discussion of the possible wandering of the Martian spin axis during the past 100 million years suggested by the unique quasi circular structures in the polar regions of Mars. Polar wandering on Mars is likely if deep convection is involved in the origin of the very large constructional volcanic features located near the equator. The magnitude of the nonhydrostatic low order components of the gravity field and their correlation with the equatorial volcanic features may be additional evidence of deep convection and associated polar wandering.-