What is the conventional archaeological date of Blinkerwall (Bay of Mecklenburg, Germany), and what alternative dates have been proposed?

Leading Edge (interpretation): Probably a human-built stone wall used to drive reindeer, according to the team that found it. Not yet independently confirmed. It must be older than the flooding of the area, about 8,500–8,000 years ago. Alternative proposals: Natural origin: what the finders weighed (2024): Could nature have built it? The team looked at several natural causes. A lakeshore pushed up by drifting ice was the least unlikely. A moraine, an esker or a tsunami fit the evidence poorly. So a natural origin was considered and judged unlikely, not ruled out. Age reasoning: IOW press release (2024): About 11,000 years old? The press release says the wall was likely built about 11,000 years ago. That number is not a date. It comes from the release's reasoning that the last reindeer herds left the area about 11,000 years ago, so a reindeer wall was likely built before then. Open questions: next steps: No direct date and no finds yet: No tools or other human-made objects have been reported from the wall so far. Divers plan to search for them. A method called luminescence dating may show when the stones last saw sunlight. The project team also wants a full 3D photo model of the wall. Old sonar data hint at similar structures in the Fehmarnsund and the Flensburg Fjord. These have not been explored.

What has been measured at Blinkerwall (Bay of Mecklenburg, Germany) in peer-reviewed studies?

Found in Sept 2021: The team spotted the wall in September 2021 in detailed sonar maps of the seafloor. A Kiel University team was there to study mineral crusts, not to look for a wall. A line of 1,673 stones: The sonar maps show 1,673 stones set side by side in a line 971 m long. The line lies 21 to 21.5 m deep. Most stones are less than 1 m high. Divers filmed parts of it and confirmed it is made of separate stones. Big stones at the bends: Most stones weigh well under 100 kg. The largest is about 11.4 tons, assuming granite. The team worked out the weights from each stone's size. The ten heaviest stones all sit where the wall changes direction. The team says natural processes cannot explain that pattern. Dates from the mud, not the wall: Two bits of wood from the mud beside the wall have been dated. They are about 10,580 and 9,890 years old. The radiocarbon dates come from nearby sediment, not the wall itself. A minimum age from the sea: Studies of past sea levels show this spot went under water by about 8,500–8,000 years ago. If people built the wall on dry land, it must be older than that. The Blinkerwall is a long line of stones on the floor of the Baltic Sea, in the Bay of Mecklenburg off northern Germany. Scientists found it in September 2021 in sonar maps. It lies about 21 m deep, some 10 km northwest of the town of Rerik. Thousands of years ago this spot was dry land, next to a lake or bog. Rising seas later drowned it. The team that found it, led by Jacob Geersen, thinks Stone Age hunters built the wall to steer reindeer. That is their reading, and no other team has checked it yet. The wall itself has not been dated, and no tools have been found at it so far. No photo is shown, because we could not confirm a license that lets us use one.

What are the stone types, heaviest block masses, and quarry transport distances at Blinkerwall (Bay of Mecklenburg, Germany)?

Heaviest stone: about 11.4 t (largest stone; weight worked out by the team from its size, assuming granite). Rock types and quarry distances are not reported in the sources cited on this page.

Sites › Europe › Blinkerwall (Bay of Mecklenburg, Germany)

Blinkerwall (Bay of Mecklenburg, Germany)

📍 Where It Is Bay of Mecklenburg, Baltic Sea, Germany (21 m deep) 54.1609°, 11.4728°

🏛️ Mainstream Date Older than about 8,500–8,000 years (minimum age; the wall is not dated) Minimum age from sea-level rise; the wall itself is not dated

🧭 Leading Edge / Open Angle Finders' reading: a wall to drive reindeer (not yet checked by others) Debated or newly revised

🪨 Heaviest Stone & Quarry Largest stone about 11.4 t (worked out from its size); most under 100 kg Compare all 65 sites →

30-SECOND TAKEAWAY

In Plain English — The 30-Second Takeaway

What It Is:

A line of stones almost 1 km long on the Baltic seafloor off Germany.

What Everyone Agrees On (Measured Facts):

Sonar maps show 1,673 stones in a line 971 m long, about 21 m deep. The heaviest stones sit at the bends. Mud beside the wall has been dated, but the wall has not.

🏛️ Mainstream Archaeology View:

No outside team has checked the finders' work yet. The wall must be older than the flooding of the area, about 8,500–8,000 years ago.

🧭 Leading Edge View:

The finders think it was a wall for driving reindeer. Natural origin was considered and judged unlikely, not ruled out.

Site Story & Overview

The Blinkerwall is a long line of stones on the floor of the Baltic Sea, in the Bay of Mecklenburg off northern Germany. Scientists found it in September 2021 in sonar maps.

▸ Read Full Archaeological & Engineering Context

It lies about 21 m deep, some 10 km northwest of the town of Rerik. Thousands of years ago this spot was dry land, next to a lake or bog. Rising seas later drowned it. The team that found it, led by Jacob Geersen, thinks Stone Age hunters built the wall to steer reindeer. That is their reading, and no other team has checked it yet. The wall itself has not been dated, and no tools have been found at it so far. No photo is shown, because we could not confirm a license that lets us use one.

✓ What Is Physically Measured on Site

Dated samples, laser scans, stone weights, and dug finds kept separate from opinion.

Found in Sept 2021: The team spotted the wall in September 2021 in detailed sonar maps of the seafloor. A Kiel University team was there to study mineral crusts, not to look for a wall. [1][2]
A line of 1,673 stones: The sonar maps show 1,673 stones set side by side in a line 971 m long. The line lies 21 to 21.5 m deep. Most stones are less than 1 m high. Divers filmed parts of it and confirmed it is made of separate stones. [1]
Big stones at the bends: Most stones weigh well under 100 kg. The largest is about 11.4 tons, assuming granite. The team worked out the weights from each stone's size. The ten heaviest stones all sit where the wall changes direction. The team says natural processes cannot explain that pattern. [1]
Dates from the mud, not the wall: Two bits of wood from the mud beside the wall have been dated. They are about 10,580 and 9,890 years old. The radiocarbon dates come from nearby sediment, not the wall itself. [1]
A minimum age from the sea: Studies of past sea levels show this spot went under water by about 8,500–8,000 years ago. If people built the wall on dry land, it must be older than that. [1]

🏛️ The Finders' Reading (Leading Edge interpretation; the mapping is Measured)

Leading Edge (interpretation): Probably a human-built stone wall used to drive reindeer, according to the team that found it. Not yet independently confirmed. It must be older than the flooding of the area, about 8,500–8,000 years ago.
Stone & hardness: Stones, mostly under 1 m high, on a ridge of glacial till (rock types not reported in our sources). Mohs hardness: not reported in our sources.
Quarry distance & alignment: Stone source not reported in the sources on this page. Orientation: Not reported in the sources on this page.

🧭 Leading Edge Proposal & Open Questions

Natural origin: what the finders weighed (2024): Could nature have built it? The team looked at several natural causes. A lakeshore pushed up by drifting ice was the least unlikely. A moraine, an esker or a tsunami fit the evidence poorly. So a natural origin was considered and judged unlikely, not ruled out. [1]
Age reasoning: IOW press release (2024): About 11,000 years old? The press release says the wall was likely built about 11,000 years ago. That number is not a date. It comes from the release's reasoning that the last reindeer herds left the area about 11,000 years ago, so a reindeer wall was likely built before then. [2]
Open questions: next steps: No direct date and no finds yet: No tools or other human-made objects have been reported from the wall so far. Divers plan to search for them. A method called luminescence dating may show when the stones last saw sunlight. The project team also wants a full 3D photo model of the wall. Old sonar data hint at similar structures in the Fehmarnsund and the Flensburg Fjord. These have not been explored. [2][3]

Primary Academic Sources

▸ View All Cited Primary Sources & DOIs (3 papers)

Geersen, J., Bradtmöller, M., Schneider von Deimling, J., Feldens, P., Auer, J., Held, P., Lohrberg, A., Supka, R., Hoffmann, J. J. L., Eriksen, B. V., Rabbel, W., Karlsen, H.-J., Krastel, S., Brandt, D., Heuskin, D. & Lübke, H. (2024). A submerged Stone Age hunting architecture from the Western Baltic Sea. PNAS 121(8): e2312008121 (published 12 February 2024; open access, CC BY-NC-ND 4.0; no correction or retraction listed on Crossref as of 1 November 2026) doi:10.1073/pnas.2312008121 data
Leibniz Institute for Baltic Sea Research Warnemünde (IOW), University of Rostock & Kiel University (2024). Traces of Stone Age hunter-gatherers discovered in the Baltic Sea (joint press release, 12 February 2024) https://www.iow.de/message/items/traces-of-stone-age-hunter-gatherers… background
Leibniz Institute for Baltic Sea Research Warnemünde (IOW). SEASCAPE: submerged Stone Age megastructures in the Western Baltic Sea (project page, accessed 1 November 2026) https://www.iow.de/project/364/seascape.html background

Dates and stone checks are summed up in plain English from the papers above. Measured facts stay separate from opinion. Methodology.