Mars Insight Lander oddity: stone like the primordial tool - the hand axe

Nice oddity: The biggest stone visible by the non-movable wide angle context camera of the new Mars Insight Lander looks like a flint hand axe.

[link to mars.nasa.gov (secure)]

[link to en.wikipedia.org (secure)]

With a 30cm diameter of the lander's foot pad, the stone is about 20cm long, so in the range of large stone age hand axes on Earth.