It is called the Lanzon, it was the vernacular name for the most significant statue of the central deity of an ancient Chavin culture of Peru. It was also the first utmost religious and racial movement in the mountains of Andes. Its central image is functioning as axis mundi which means the pivot linking between heavens, earth, and an underworld.
marble i think since they build a few temples for the gods with marble but normal people would build with mud idk if it can be called cement.
Who did kelper replace after serving as his assistant