It's another demonstration of mankind's technological innovation.
- During the Middle Preclassic Period, which lasted until about 300 B.C., Maya farmers began to expand their presence both in the highland and lowland regions.
The Middle Preclassic Period also saw the rise of the first major Mesoamerican civilization, the Olmecs.
The Paleozoic Era ran from about 542 million years ago to 250 million years ago. Hope this helps!