Ben Tre Fm
Type Locality and Naming
The type section is established on the basis of drilling materials from borehole 218, drilled at the General Hospital of Ben Tre Town, at a depth of 584 - 654.5 m (N = 11°15’; E = 106°23’).
Synonym: Hệ tầng Bên Tre : Ngọc Hoa et al. 1990, 1996.
Lithology and Thickness
Type section: (Ỉ). (depth 1000-960 m): conglomerate and gravelstone with pebbles of granite, quartz, chert, felsic volcanics and red-brown siltstone, cement from sand with some silt, 40 m thick. (2). (depth 960-905 m): grey, fine-grained loose sand, with an interbed (7 m) of grey, micritic limestone with cryptocrystalline texture, 55 m thick. (3). (depth 905-722 m): mainly claystone and siltstone interbedded with light-grey, fine sandstone and micritic limestone, 183 m thick. The total thickness of the formation in this section is 278 m.
Relationships and Distribution
Lower contact
Unconformably upon the Tra Tan Fm.
Upper contact
Unconformably rests under the Upper Miocenc Phung Hiep. Top is an erosion surface
Regional extent
Its sections usually lie under Quaternary cover at a depth of about 600-900 m increasing gradually southward in the Ben Tre, Tra Cu and Phung Hiep areas.
GeoJSON
Fossils
Florschuetzia levipoli, Picea sp., Juglans sp., Ilex sp., Betula sp.. Myrica, Trudopoỉlis, Pinus, Erica, Quercus and Lygodium.
Age
Depositional setting
Additional Information