Quaternary depressions in Vietnam (namely the Cuulong River, the Red River, and coastal depressions in the central part of the country) were filled mainly by continental deposits in five cycles as follows: (V) Upper Holocene (Thaibinh and Dongkhoi formations); (IV) Lower to Middle Holocene (Haihung and Tanthanh Binh-chanh formations); (III) Upper Pleistocene (Vinhphuc formation); (II) Middle to Upper Pleistocene (Hanoi and Thuduc formations); (I) Lower Pleistocene (Lechi, Trangbom, and Hoanghoa formations). Each cycle starts with a regression and ends with a transgression. Within the Quaternary the maximum regressive phase was in the Middle to Upper Pleistocene (beginning of cycle II) and the maximum transgressive phase in the Middle Holocene (end of cycle IV). © 1991.

Nghi T., Ngo Quang Toan, Do Thi Van Thanh, Nguyen Dinh Minh, Nguyen Van Vuong

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Từ khóa : cyclic deposition; delta; Quaternary; regressive phase; sedimentary cycle; sedimentary cycles; transgressive phase; Vietnam