Did Ice Age Paleo-Indians love fruit? Ancient seeds at Pennsylvania riverbank say yes

The Delaware River discovery challenging the Clovis First Theory

The Delaware Water Gap holds secrets from America’s first people that changed everything we thought we knew about Ice Age life.

In 1972, amateur archaeologist Donald Kline found charcoal near the Delaware River that turned out to be 12,900 years old. The site revealed Paleo-Indians eating grapes, plums, and berries alongside mammoth hunts.

They made tools, cooked meals, and lived full lives at the end of the Ice Age.

This discovery shattered the idea that early Americans only hunted big game and proved they had complex, plant-rich diets thousands of years earlier than expected.

Here’s how this remarkable find rewrote American prehistory and where you can explore their ancient world today.

Amateur Archaeologist Stumbles Upon Ancient Remains Along Delaware River

Don Kline, a guy who loves old stuff, found bits of charcoal in 1972 where Delaware River meets Brodhead Creek in Monroe County. He spotted this evidence 8 feet down in layered soil, under a band of clay.

Kline checked out an eroded terrace at Price’s landing, finding a higher second terrace facing south with hills blocking cold north winds. Tests later proved people lived along these Delaware banks over 10,500 years ago.

University Team Unearths Thousands of Ice Age Artifacts

From 1974 to 1977, Dr. Charles McNett from American University took over digging at Shawnee-Minisink.

His team dug through 3,900 square feet, going down about eight feet, and found over 55,000 artifacts. The National Geographic Society and National Science Foundation gave more than $80,000 for this work.

The site was so important that experts formed the Upper Delaware Valley Early Man Project to study it.

Carbon Dating Pushes Back Timeline of Eastern Settlement

Tests on Kline’s wood charcoal from a 1972 hearth showed it was 10,590 ± 300 years old. More charcoal samples dated between 10,900 and 11,000 years ago.

These dates make the Shawnee-Minisink Clovis points the oldest in the Eastern United States.

The carbon-14 results, from around 11,000 BCE, place human activity here among the earliest known in eastern North America after the Ice Age.

Massive Flood Preserved Ancient Living Floors for Millennia

The Paleoindian items sit below a thick layer of flood deposits, keeping them separate from Early Archaic items above. These artifacts stayed exactly where they fell nearly 11,000 years ago.

Almost 8 feet of dirt covered and protected the treasures at Shawnee-Minisink through the centuries.

This middle layer had zero artifacts and got laid down all at once, pointing to a single huge flood that sealed everything below.

Rare Spearpoints Show Hunting Technology of First Americans

Two Clovis spearpoints turned up at the site, showing the earliest-known style with fluting – a groove likely made to attach points better to wooden shafts.

Scientists named the first jasper point "The Kline Point" to honor its finder.

A second Clovis fluted point came to light during later digs between 2003-2006, linking the site to these earliest North American toolmakers.

Stone Tool Workshops Reveal Daily Life 11,000 Years Ago

Several spots with clusters of stone flakes show where people sat making or fixing tools at the end of the Ice Age. The team found over 150 endscrapers, tools used for working with animal hides.

All told, more than 200 endscrapers turned up at Shawnee-Minisink.

The site holds about 32,736 stone artifacts total, with those 214 endscrapers making up the biggest group of finished tools.

Ancient Cooking Fires Hold Keys to Prehistoric Meals

Shawnee-Minisink stands out as one of the first Eastern Paleoindian sites where actual features like hearths were found. Two cooking fires in the Clovis levels still held charred food remains.

These hearths and nearby tool-making areas create one of the best examples of a Paleoindian living floor ever found in the eastern United States.

The north side of one hearth had almost no artifacts, telling us winds likely blew from the south.

Fruit Seeds Challenge Beliefs About Ice Age Hunters

Charred hawthorn seeds and hickory nuts from the hearths show these early people ate more than just meat.

Remains of fish and fruit proved their diet was much more varied than experts thought possible for the late Ice Age. For years, everyone pictured Paleoindians as "big game hunters" chasing mammoths and extinct bison.

Kline noted that all these seeds and bones suggest these folks spent lots of time collecting fruit and fishing.

Unique Plant Life Created Food-Rich Environment After Ice Age

Northern Pennsylvania back then had what experts thought was a cold, spruce-filled open forest.

But the charred hickory nuts and tree charcoal from the hearths paint a different picture – a mix of pine and leafy trees unlike any forest today.

Around their camp grew white pine, birch, and willow with not much underbrush.

The swings between cold and warm created what scientists call a "mosaic environment" with lots of different food options.

Local Black Flint Powered Stone Tool Industry

Most artifacts at Shawnee-Minisink were made from local black flint (92%), showing these people knew their local resources well.

A vein of black flint, stone chips, and hammer stones found at the Zimmerman Flint Quarry about a mile from the dig site was likely their workshop.

People made points and tools from both nearby stone and materials from farther away. Early humans picked their campsites partly based on how close they were to good tool-making supplies.

Site Challenges Theory of How People First Settled America

The old "Clovis First" model claimed humans entered North America around 12,000 years ago, invented fluted points out west, then quickly spread across the Americas by 10,500 years ago.

Shawnee-Minisink has the earliest dates for Clovis points in the East, changing our understanding of how people moved across the continent.

New digs showed evidence that people came back to this spot multiple times during the Clovis period.

Except for Meadowcroft Rockshelter, this site has the oldest carbon 14 dates for human activity in Pennsylvania and some of the earliest in the eastern United States.

Visiting Delaware Water Gap National Recreation Area, Pennsylvania

You can visit the Shawnee-Minisink archaeological site at River’s Edge Park on River Road in Minisink Hills, Monroe County.

The historical marker is available 24 hours daily and explains how this 12,900-year-old Paleo-Indian site changed what we know about Ice Age diets.

The marker is near where the Delaware River and Brodhead Creek meet, and it’s part of the larger 70,000-acre Delaware Water Gap National Recreation Area.

This article was created with AI assistance and human editing.

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