8th Millennium BC - Environmental Changes

Environmental Changes

Holocene Epoch

↑ Pleistocene
Holocene/Anthropocene
Preboreal (10.3 ka – 9 ka), Boreal (9 ka – 7.5 ka), Atlantic (7.5 ka – 5 ka), Subboreal (5 ka – 2.5 ka) Subatlantic (2.5 ka – present)

c. 8000 BC—Glaciers form the rock formation in present-day New Hampshire, formerly known as the Old Man of the Mountain
c. 7911 BC—Series of seven massive volcanic eruptions give volcanic skies and lowered temperatures for several centuries (ending 7090 BC). Locations not known, but show in polar ice. (NatGeo1986–9)
c. 7640 BC—Date theorized for impact of Tollmann's hypothetical bolide with Earth and associated global cataclysm
c. 7220 BC—Eruption of Mount Edgecumbe, Alaska
Large outflow of fresh water from Black Sea into Aegean Sea

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