How could people thousands of years ago quarry rocks so large and transport them 140 miles? Even today with modern machinery and vehicles it would be a monumental undertaking. Were off world technologies used?
Poverty Point National Monument
From Wikipedia on Poverty Point:
Researchers have learned that Mound A was constructed quickly, probably over a period of less than three months. In total volume, Mound A is made up of approximately 238,000 cubic meters of fill, making it the second-largest earthen mound (by volume) in eastern North America.
238,000 cubic meters is 8,404,890.68 cubic feet.
How much does it weight? From ask.com, “One cubic meter of soil weighs between 1.2 and 1.7 metric tonnes, or between 2,645 and 3,747 pounds. Loose topsoil is lighter, and compacted topsoil is heavier.”
How many man hours would take to build mound A in three months, and with what size support staff would they require?
Watch from 5:00 to 5:20