The other stonework and facing of the Pumapunku consists of a mixture of andesite and red sandstone. The core of the Pumapunku consists of clay. The fill underlying selected parts of the edge of the Pumapunku consists of river sand and cobbles instead of clay. Excavations at the Pumapunku have documented "three major building epochs, in addition to small repairs and remodeling"

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Some of the stones are in an unfinished state, showing some of the techniques used to shape them. They were initially pounded by stone hammers—which can still be found in numbers on local andesite quarries—, creating depressions, and then slowly ground and polished with flat stones and sand.


https://en.wikipedia.org/wiki/Pumapunku