Curiosity rover photographs thigh bone-shaped rock on Mars

[old steel]

Cro-Magnon?

http://cnet4.cbsistatic.com/hub/i/r/2014/08/22/3a57f7fa-f681-4422-bfe9-720923da45aa/resize/770x578/e2fad9244a49c9b762e1fdf0afa55837/marsbone.jpg

[Shami-Amourae]

Dirt and rocks.

[Horn]

What of the blue cement it was encased in?

[mick silver]

theres no mar it just photo shop from the pics of the moon