Transition between maritime hunter-gatherer Mesolithic populations and first Neolithic sedentary populations occurred during slowdown of sea level rise

February 08, 2026Underwater

Source: Breaking News: 7000 year Old Ruins Found Under The Sea by The Randall Carlson

Île de Sein off Brittany was once MUCH larger — the black outline shows its extent 7,900 years ago vs the tiny modern island. Rising seas drowned it 🏝️🌊

Key facts claimed:

- Maritime hunter-gatherer Mesolithic populations transitioned to first Neolithic sedentary populations during slowdown of sea level rise

- Structures built during Mesolithic-Neolithic transition

- Oldest fish weir at depth of -8.4 meters estimated constructed between 5750-5300 BCE (7,700-7,300 years ago)

- Median age approximately 5450 BCE (7,400 years ago)

- Neolithic farmers in Brittany dated to beginning of fifth millennium BCE (5000-4000 BCE)

Key facts

Transition between maritime hunter-gatherer Mesolithic populations and first Neolithic sedentary populations occurred during slowdown of sea level rise
Structures built during Mesolithic-Neolithic transition
Oldest fish weir at depth of -8.4 meters estimated constructed between 5750-5300 BCE (7,700-7,300 years ago)
Median age approximately 5450 BCE (7,400 years ago)
Neolithic farmers in Brittany dated to beginning of fifth millennium
Late Mesolithic shell middens (Beg en Dorset) dated 5700-5400 BCE (7,700-7,400 years ago)
First Neolithic habitats in Brittany (Pluvenon) dated 5300-4700 BCE (7,500-6,700 years ago)
Neolithic process spread to western Brittany from beginning of fifth millennium
No known shell middens in Brittany from early or middle Neolithic
Hunter-gatherer fishermen populations had knowledge of marine biotope
Meeting between Neolithic peoples from east and local hunter-gatherers occurred end of sixth millennium (approximately 8,000 years ago)