| Abstract: |
English summary on page 91 as follows: It is suggested on the existence of ancient seabords ranging from -60,-50m by -30,-25m (corresponding with the dates of 7,500 - 7,000 and 6,000 - 5,500 BP respectively.) at the bottom of North Viet Nam Bay, up to 1,2m and 3,6m (corresponding with the dates of 3,000 and 4,500 - 4,000 BP respectively) on the North Viet Nam coast-plain. It's concerened with the results of Flandrian trangsgression upon the northern Viet Nam sea-shore during the Holocene. The ancient sea level line at 3-6m correspoinds with the highest level of that transgression upon the northern Viet Nam coast-plain. As for the ancient level at 1-2m, it shows the further regression. The marine terraces derived from these two levels (1-2m, 3-6m) are of variuous altitudes owing to neotetonic movements happened during the Holocene.
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