晚更新世的最后一次冰期,当全球海平面下降到现海平面-50m左右,台湾海峡即消失。除了澎湖岛群东南部一片深海域仍为南海东北边一角外,闽-台之间成为一片洼地。这时,闽-台两地的居民互相来往已无天堑之隔,只有一条宽度不大的中心河道,渡过此河便可通达彼岸。本文全面分析了本区的自然条件、全球海平面变化和地貌冲淤环境之后认为:从福建的晋江向东,早期以航行,后来只过渡口,取道长元高地上岸可直通台中各地。这是一条便捷和安全兼备的古通道,是古人经过上万年的实践走出的一条传统的故道。此线对下一步海峡两岸进行现代化的跨海通道选线勘研有良好的导向和启迪作用。During the last ice age of the late Pleistocene,with the falling of sea level down to-50 m with respect to the present sea level,Taiwan Strait disappeared.Besides of a narrow deep sea area to the south of the Penghu Islands,the area between Fujian and Taiwan became a lowland,and except a river passing through it from north to south,the communications of people between Fujian and Taiwan became very easy.Based on a detailed analyses of the main factors,including natural conditions,sea level changes, physiognomies and sedimentation environments,it is concluded in this paper that there was an ancient routeway from Jinjiang to Changyuan High-land,and to the middle part of Taiwan.The routeway was a shortcut formed by ancient people for over 10 thousands years.The discovery will be significant to the study of a modern routeway such as a tunnel across Taiwan Strait in the future
