Meltwater pulse 1B, a sudden rise of sea level by 7.5 m (25 ft) within about 160 years. (jan 1, 9200 BC – jan 1, 9000 BC)
Description:
https://en.wikipedia.org/wiki/Meltwater_pulse_1BAdded to timeline:
Date:
jan 1, 9200 BC
jan 1, 9000 BC
~ 200 years