For the past year and a half, with scant public attention, squads of archaeologists digging at the Miami River site of a planned Related Group residential tower complex have unearthed remarkable finds, consisting of thousands of fragmentary prehistoric tools and artifacts, rare and well-preserved animal and plant remnants, vestiges of ancient structures and human remains — including some relics dating back to the earliest days of civilization on the planet.

Independent scientists say the findings, which include 7,000-year-old spearheads, are clear and abundant evidence of a continuous indigenous settlement in the area stretching much farther back in time than previously thought. The discovery, they say, may be the most significant in a series of archaeological finds made at the mouth of the Miami River in the past 25 years that include the Miami Circle National Historic Landmark, thought to be around 2,000 years old.

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“There are artifacts going back sequentially over those thousands of years,” said William Pestle, an archaeologist and chairman of the anthropology department at the University of Miami, who is not involved in the excavation at the Related site but is familiar with the discoveries there. “This is like a continuous record, which is powerful and cool.

Read more: Miami Herald