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相距3~20km的岭头、罾口河、俵口和空港物流中心4处埋藏牡蛎礁体的年代学研究证实,开始发育的时间不同,但同时在4.2~4.0ka cal BP时结束建礁,即其灭亡与“4.2ka事件”在时间上重合。岭头、罾口河剖面O稳定同位素和罾口河剖面孢粉数据进一步表明,4.5~4.3ka cal BP时研究区气候出现变冷变干的趋势,4.3~4.2ka cal BP逐渐好转,推测这一气候波动变化过程可能是对“4.2ka事件”的响应。
Geochronological studies at 4 burying oyster reefs in Lingtou, Qiaokouhe, Qiaokou and Airport Logistics Center at a distance of 3 ~ 20km confirmed that the developmental time was different, but at the same time the reefing ended at 4.2 ~ 4.0ka cal BP, that is, Its demise coincides with “4.2ka incident” in time. The data of sporopollen in O stable isotope and Qikouhe section of Lingtou and Qikouhe sections further indicate that in the 4.5 ~ 4.3ka cal BP climate, the climate tends to become colder and colder, and 4.3 ~ 4.2ka cal BP gradually improves, suggesting that A climate change process may be a response to “4.2ka event ”.