Bonneville is also the final resting place of Spirit's heat shield, jettisoned during the landing procedure; the heat-shield could be seen glinting on the opposite wall when Spirit photographed the crater.

The strata into which Bonneville formed is thought to be loose debris,[citation needed] although some of the ejecta may have originated from more competent rocks.

No underlying bedrock was exposed in the crater or the numerous craterlets in Bonneville's walls.

[1][2] It is likely that Bonneville is a secondary crater, given its low depth to diameter ratio.

This article about an impact crater on Mars or its moons is a stub.