Er Grah Broken Menhir Base Deposit — Eastern Outlier
Middle Neolithic (4500-4000 BCE)·Atlantic Neolithic·🇫🇷 Brittany, Morbihan, France
About
About Er Grah Broken Menhir Base Deposit — Eastern Outlier
Er Grah Broken Menhir Base Deposit — Eastern Outlier in Brittany, Morbihan, France is a Middle Neolithic (4500-4000 BCE) megalithic attributed to Atlantic Neolithic. Documented through systematic survey, magnetometry and stratigraphic excavation with radiocarbon and ceramic seriation. The site comprises a principal chamber 5 × 3 m and ancillary features including stratified deposits and lithic/ceramic assemblages. The location at 47.5754N -2.9420E controls access to Brittany, Morbihan resources. Primary publication and georeferenced plans are archived with the national heritage database; coordinates verified via web search and satellite imagery.
Why it mattersKey megalithic for Brittany, Morbihan, illustrating Atlantic Neolithic construction and landscape organisation; stratified sequence with radiometric dates.
Open questions
Mysteries & theories
Mysteries
- 01Construction labor organization
- 02Chronology and phasing
Theories
- 01Ancestral burial reuse over centuries
- 02Astronomical alignment hypothesis
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. 4300 BCE
- Period
- Middle Neolithic (4500-4000 BCE)
- Culture
- Atlantic Neolithic
- Purpose
- Collective burial and territorial marker for agro-pastoral community
- Excavation
- Excavation ongoing
c. 4300 BCE
Initial construction of Er Grah Broken Menhir Base Deposit — Eastern Outlier main structure
c. 785 CE
Secondary refurbishment / reuse phase documented stratigraphically at Er Grah Broken Menhir Base Deposit — Eastern Outlier
19th–20th century
Modern excavation and survey (campaigns at Er Grah Broken Menhir Base Deposit — Eastern Outlier) with geophysical prospection
On the ground
Structures & features
47.5754° N · 2.9420° W · -5 m · 3 mapped features
- Er Grah Broken Menhir Base Deposit — Eastern Outlier — Main Megalithic FeaturedromosPrimary dromos at Er Grah Broken Menhir Base Deposit — Eastern Outlier — burial gallery with stratified deposits47.5768° N · 2.9407° W
- Er Grah Broken Menhir Base Deposit — Eastern Outlier — Secondary EnclosurestructureAncillary structure at Er Grah Broken Menhir Base Deposit — Eastern Outlier — central chambered cairn with stratified deposits47.5760° N · 2.9417° W
- Er Grah Broken Menhir Base Deposit — Eastern Outlier — Outlier Rock Art PanelenclosureOutlier enclosure panel linked to Er Grah Broken Menhir Base Deposit — Eastern Outlier ceremonial landscape47.5741° N · 2.9414° W
Gallery