Tumulus de Mont-Iouarn (Ploumilliau)
Mont Iouarn Cairn · Ploumilliau Tumulus
Middle to Late Neolithic·Armorican Neolithic·🇫🇷 Brittany, Côtes-d'Armor, France
About
About Tumulus de Mont-Iouarn (Ploumilliau)
Passage mound tumulus at Ploumilliau (c. 3500 BCE), 30 m diameter, 5 m high, with granite passage and chamber, excavated 1950s revealing Neolithic pottery and human remains, overlooking Leguer valley.
Why it mattersNorthern Brittany passage tumulus linking coastal and interior traditions.
Open questions
Mysteries & theories
Mysteries
- 01Leguer valley settlement link
- 02Chamber construction sequence
Theories
- 01Valley-territorial marker
- 02Collective burial for Ploumilliau community
Theories are interpretations, not findings. The seal above tells you how much scholarly weight the place carries.
History
How it came to be
- Built
- c. 3500 BCE
- Period
- Middle to Late Neolithic
- Culture
- Armorican Neolithic
- Purpose
- Passage grave tumulus
- Rediscovered
- Modern excavation 19th–20th century
- Excavation
- Excavated
c. 3500 BCE
Initial construction / first occupation at Tumulus de Mont-Iouarn (Ploumilliau)
19th century / 1960s
Antiquarian notice and modern systematic excavation of Tumulus de Mont-Iouarn (Ploumilliau)
2000s
Conservation and publication of final reports for Tumulus de Mont-Iouarn (Ploumilliau)
On the ground
Structures & features
48.6150° N · 3.5200° W · 55 m · 3 mapped features
Granite Passage (7 m)
corridor7 m passage with 5 orthostats per side opening southeast
48.6151° N · 3.5199° WCorbelled Chamber
chamber3 m polygonal chamber with corbelling and capstone
48.6149° N · 3.5199° WTumulus Kerb West
kerbWestern kerb 4 granite blocks 1.5 m
48.6152° N · 3.5201° W