SUMMARY
New data
on stratigraphy and paleontology of Lower Triassic sediments
in
Đặng Trần Huyên, Nguyễn Đình Hữu,
Nguyễn Hữu Hùng, Đoàn Nhật Trưởng,
Based on the results of
field study of authors of this paper the Cò Nòi Formation in West Bắc Bộ has
been subdivided into two formations: the Hua Tất Formation including terrigenous
sediments of estuarine facies, and the Pa Khôm Formation composed of calcareous
sediments, with the age of Induan and Olenekian, respectively. Fossils collected
formerly and recently have been divided into paleontological zones, proving the
age of described formations.
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