60年代,天津考古工作者在对宁河、天津、黄骅等地进行多次考古调查和清理发掘后提出:“天津郊区、黄骅北部和宁河南部,仅见战国和西汉遗存,不见西汉晚期和东汉的遗存,再迟的就是唐宋时期的遗物,在年代上不连续,中间有一个突出的割裂现象。”;这个问题一提出来,就引起了学术界的关注。谭其骧先生首先著文提出:西汉末年渤海西岸曾发生过一次大海侵。这种说法很快被天津考古界接受。到了70年代,天津考古界对海侵的看法有了一些值得注意的变化,不再称“海侵”而称“海溢”(这是历史文献的说法),认为“海溢后不久, In the 1960s, after several archaeological surveys and excavations on Ninghe, Tianjin and Huanghua, Tianjin archaeologists proposed: “In the suburbs of Tianjin, northern Huanghua and southern Ninghe, only the warring states and the remains of the Western Han Dynasty were not seen except in the late Western Han Dynasty and Eastern Han Dynasty The relics of the late Tang and Song Dynasties are relics of the late Tang and Song dynasties, which are discontinuous in the years and have a prominent phenomenon of fragmentation in the middle. ”This issue has drawn the attention of academics. Tan Qiaotong first published the article: the western end of the Western Han Dynasty Bohai Sea had a major invasion of the sea. This argument is quickly accepted by the Tianjin archeology. By the 1970s, the archaeological community in Tianjin had some noteworthy changes in its view of transgression. It no longer called “transgression” and called “sea overflowing” (this is a historical document), saying that "shortly after the sea is over,