It resembles an ancient Martian skeleton, in my perspective. To bring out the nuances in the film, I applied a moderate colorization.
The relic is a big skull with an elegant or beautiful crown, implying that it is the remains of a ruler, religious figure, or slain warrior.
These appear to be the skeleton remains of an alien humanoid, in my opinion. I used cross-references to compare the artifacts’ fragments to human bones, and the parallels are astounding.
This proves beyond a shadow of a doubt that life once existed on Mars.