How could stone surfaces be machined to tolerances we can barely meet today, when humans were still hunter gatherers?
How could the Mayan calendar be more accurate than our atomic clocks today?
How is it that the value of Pi could be annotated on cave walls many thousands of years before mathematicians existed?
Mayans were a well structured society and were not a bunch of disconnected hunter-gatherers and yes they could carve stones to fit. "Machined to tolerances" is an AA term applied to descriptions of masonary techniques, which misrepresents the accuracy involved.
The Mayan calender is nowhere near as close to atomic clocks of today.
Show up a picture of this cave representation of PI and for the record, a "mathematician" can be used to describe a child counting to 10.
Did you read all of this thread and visit the links provided?