Looking at the other images, it seems pretty obvious that this is just one of a multitude of rock fragments split and disturbed by the ground bulge from the impact (that formed the crater).
Taken out of context, it looks like a piece of wood lying on mudcracked sediment, but the mudcracked appearance is apparently a result of localized deformation proximal to the crater and caused by the impact. NEAT!
Darn you have a way with words...I couldn't have said it better. If it wasn't for all the humor in this thread I would have split long ago.