Ba Mieu Fm
Type Locality and Naming
The type section is established near Ba Micu Village (in the vicinity of Bien Hoa Town, Dong Nai Province) (E = 10°52’; E = 106°55’). It was named by
Synonym: Hệ tồng Bà Miêu: Lê Đức An et al. 1981,1984,1985,1993; Bùi Phú Mỹ 1986; Trịnh Dánh (in Phan Cự Tiến et al) 1989, (in Vũ Khủc, Bùi Phú Mỹ et al) 1990, (in Vù Khúc et al) 2000; Nguyễn Ngọc Hoa et al. 1996. Đi'êp Bà Miêu : Hà Quang Hải, Ma Công Cọ 1988; Nguyễn Ngọc Hoa C et al. 1991; Nguyễn Địch Dỹ 1987.
Lithology and Thickness
Upward: (1). Coarse- to medium-grained, pebble- and gravel-bearing polymictic sandstone, 37-45 m thick. (2). Coarse, polymictic sandstone interbeddcd with siltstone, 60-70 m thick. (3). Sandstone, siltstone and claystone, 27-33 m thick. The total thickness of the formation in this section is 125-150 m, but in some places it reaches only over 10 m.
C
Relationships and Distribution
Lower contact
Conformably rests upon the Lower Pliocene Nha Be Fm
Upper contact
Quaternary
Regional extent
The Ba Mieu Fm occurs largely in the East Nam Bo region in the form of small inselbergs (at Ba Mieu, Long Binh, Thu Due, Tinh Thuong Hamlet) or erosional slopes (at Tan Ba, Tan Uyen, Ben Cat, Rach Son, Thu Dau Mot, Nhon Trach, etc.).
GeoJSON
Fossils
Melosira italica, M. praegranuỉata, M. sp.. Persea conchica, Dalbergia rectinervis, D. bella, etc. and sporomorphs. Callophyilum dongnaiense, Eugenia pierrii, Cassia bicapsularis, Dalbergia bella, Persea conchica, Vatica aff. V. dyeri, Arundo sp,.
Age
Depositional setting
It is interpreted as alluvial and proluvial sediments.
Additional Information