- Stratigraphic Units. - of Viet Nam. - Tong-Dzuy Thanh, Vu Khuc, Dang Tran Huyen, Do Bat, Doan Nhat Truong, Nguyen Dich Dy, Nguyen Huu Hung,. - Tong-Dzuy Thanh, Vu Khuc. - SEDIMENTARY BASINS IN THE GEOLOGICAL. - EVOLUTION OF VIET NAM [Tran Van Tri, Tong-Dzuy Thanh, Vu Khuc]. - Neoproterozoic – Middle Paleozoic megacycle 7. - BAC BO REGION (North Viet Nam) 26. - NORTH TRUNG BO REGION (North Central Viet Nam) 39. - CENTRAL TRUNG BO REGION (Mid Central Viet Nam) 40. - Kim Son Formation (NA-PP ks) 47. - BAC BO REGION (North Viet Nam) 70. - EAST BAC BO 70. - WEST BAC BO 92. - Dong Son Formation (O 1 ds) [Tran Huu Dan] 102. - BAC BO REGION (North Viet Nam) 120. - Duong Dong Formation (D 1 - D 2 e dd) [Nguyen Huu Hung] 140 Ban Pap Formation (D 1 p-D 3 fr bp) [Tong-Dzuy Thanh, Ta Hoa Phuong] 142 Tan Lap Formation (D 2 g-D 3 fr ? tl) [Nguyen Huu Hung] 150 Do Son Formation (D 2 gv. - MIDDLE-UPPER DEVONIAN – LOWER CARBONIFEROUS 156. - CENTRAL TRUNG BO REGION (Mid Central Viet Nam) 196. - NAM BO REGION (South Viet Nam) 198. - BAC BO REGION (North Viet Nam) 201. - LOWER CARBONIFEROUS 206. - LOWER CARBONIFEROUS - PERMIAN 210. - LOWER CARBONIFEROUS 229. - SOUTH TRUNG BO AND NAM BO REGIONS 236. - BAC BO REGION (North Viet Nam) 245. - EAST BAC BO [Dang Tran Huyen] 245. - Lang Son Formation (T 1 i ls) 251. - Mau Son Formation (T 3 c ms) 267. - WEST BAC BO 269. - TRUNG BO REGION (Central Viet Nam) [Dang Tran Huyen] 285 VIET-LAOS AREA (Extreme West Bac Bo and North Trung Bo) 285. - CENTRAL TRUNG BO AND SOUTH TRUNG BO REGIONS 292. - NAM BO REGION 295. - EAST NAM BO 295. - WEST NAM BO AND GULF OF THAILAND 298. - BAC BO REGION (North Viet Nam) 304. - EAST BAC BO 304. - WEST BAC BO 313. - TRUNG BO REGION (Central Viet Nam) 319. - CENTRAL TRUNG BO AREA (Mid Central Viet Nam) 321. - Binh Son Formation (J 1-2 bs) [Vu Khuc] 331. - SOUTH TRUNG BO AND EAST NAM BO REGIONS 332. - WEST NAM BO AND GULF OF THAILAND REGIONS 342. - BAC BO REGION (North Viet Nam) 344. - EAST BAC BO 345. - WEST BAC BO 348. - TRUNG BO REGION (Central Viet Nam) 352. - UPPER JURASSIC – LOWER CRETACEOUS 353. - SOUTH TRUNG BO AND EAST NAM BO REGIONS 356. - WEST NAM BO AND GULF OF THAILAND REGIONS 362. - TERTIARY ON THE MAINLAND 369. - BAC BO REGION (North Viet Nam) 369. - EAST BAC BO 369. - WEST BAC BO [Vu Khuc, Nguyen Dich Dy] 391. - NORTH TRUNG BO REGION (N of Central Viet Nam) [Vu Khuc, Nguyen Dich Dy] 396. - Sam Son Formation (N 2 ss) 398. - SOUTH TRUNG BO REGION (South Central Viet Nam) 400. - EAST NAM BO REGION (E of South Viet Nam) [Vu Khuc, Nguyen Dich Dy] 405. - WEST NAM BO REGION (W of South Viet Nam) [Vu Khuc, Nguyen Dich Dy] 407. - TERTIARY ON THE CONTINENTAL SHELF 412. - NORTH OF THE BAC BO GULF 412. - Con Son Formation (N 1 2. - Nam Con Son Formation (N 1. - INDEX OF STRATIGRAPHIC UNITS 474. - The geology of Viet Nam’s territory has been regularly studied for over a century, during which nearly 8.000 research works on the geology of Viet Nam were published. - Important successes in stratigraphy have been achieved, which play the key role in understanding the structure and geological history of the country’s bedrock.. - In the twentieth century over 500 stratigraphic unit names have been published or proposed, and a lot of them became popular in the Vietnamese geological language. - Before the 50’s of the last century stratigraphic research was carried out by French and other foreign geologists, who used different styles. - At that time a great number of stratigraphic units were described using different stratigraphic conceptions. - Though the Stratigraphic Code of Viet Nam has been approved and published (1994) many junior Vietnamese geologists understood the lithological properties of the lithostratigraphic unit as rigid and usually describe a new unit and use a new term, although there is only a facies change of a previously defined unit. - In this situation, an assessment of the validity of Viet Nam’s stratigraphic units becomes pressing, and a revision of Viet Nam’s stratigraphic units, including those of the continental shelf and the subsurface on the mainland, is presented in this work.. - The Quaternary sediments are distinguished by their special characteristics, and many units were described, but there still are disagreements on the principles of their division in Viet Nam.. - Therefore in the “Stratigraphic units of Viet Nam”. - the units from Precambrian to Neogene are dealt with, but Quaternary sediments will be described only in the Neogene - Quaternary units.. - According to the “Stratigraphic Code of Viet Nam” (1994) effusive bodies are not described as stratigraphic units if there are no sedimentary interbeds in their sequences. - In following the regulation of the “Stratigraphic Code of Viet Nam”, they will be described as stratigraphic units in this work.. - In former works stratigraphic units from oldest to youngest were usually described in the frame of the regions determined in accord with present geological structure. - The territory of Viet Nam includes the mainland and the vast marine shelf belonging to different geological structural units. - In the historical development of regional geology the structural units have changed, and there are no stable units through all geological periods for tens and hundreds of millions of years. - For this reason, in the “Stratigraphic units of Viet Nam” the regional division for the stratigraphic description is not fixed through all great stratigraphic intervals, but each has its own scheme. - the regional division is based on the paleobasin analysis presented in chapter 3, but each scheme has its distinguishing features according to the characteristics of the units.. - At present there are many problems in the stratigraphy of the country that are debated in geological circles. - For the main problems the editor has referred to the “Stratigraphic Code of Viet Nam” and resolved them on the basis of new materials gathered by other geologists. - Nevertheless many new problems are expected that will need detailed studies in the near future. - For instance, the case of the Ta Khoa, Ngoc Lam formations, and Nam Cuoi Complex, as well as many effusive - sedimentary formations etc.. - Authors of this monograph are geologists from different research institutions of Viet Nam, and they are as follows. - Tong-Dzuy Thanh, Nguyen Huu Hung (NHH), Ta Hoa Phuong (THP), Pham Huy Thong (PHT), and Tran Van Tri (TVT). - Doan Nhat Truong (DNT), Tong-Dzuy Thanh. - The Content, Index of geographic and geologist names, and Index of stratigraphic names were compiled by Tong-Dzuy Thanh and Vu Khuc. - The detailed author index of items in each chapter will be indicated in the Contents by the abbreviation of the author names as shown above.. - The monograph “Stratigraphic units of Viet Nam” is an improved work of the Research Project KT led by Tong-Dzuy Thanh. - It includes materials of the authors carried out over many years in their research and that of colleagues published at home and abroad, and some materials conserved in the geological Archives are also referred to. - The manuscript was accomplished in the framework of the Fundamental Research Program (Project 721101. - Assessing the validity of stratigraphic units of Vietnam led by Tong-Dzuy Thanh). - The realization of this Project and the accomplishment of the manuscript was supported by the Council for Natural Sciences, the Council of Earth Sciences, the College of Natural Sciences (Vietnam National University, Ha Noi), and the Department of Geology &. - Mineral Resources of Viet Nam.. - The authors are deeply grateful for the valuable support of the named organizations.. - Manuscript was written in Vietnamese and edited by Tong-Dzuy Thanh (Viet Nam National University, Ha Noi). - Vu Khuc (Viet Nam Paleontological Association) edited the parts on Mesozoic and Cenozoic, the English version was translated by Vu Khuc, Tong-Dzuy Thanh, and Trinh Van Long. - Tong-Dzuy Thanh