An eye socket, a nose mark and the shape of a mouth line are easily recognizable in the skull, yet the horns on its head.
It seems unlikely that this tiny creature is just something produced by wind, water and time. It has all the features of a biological live form that once lived on Mars and maybe is still living there.
Link: SOL 1424
Link Image: http://mars.jpl.nasa.gov/msl/multimedia/raw/?rawid=CR0_523905429PRC_F0561236CCAM03422L1&s=1424