Nannopaleontological Evidences at Paleogene and Neogene Boundary of Minbu Basin, Central Myanmar

• Main Authors: Lwin, Ni Ni, Phyo Wai Lin
• Format: Text
• Language: unknown
• Published: Zenodo 2019
• Subjects: nannoplankon, biostratigraphic, lithostratigraphic, disconformity,Paleogene, Neogene, regression,transgression; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.5281/zenodo.3921095; https://zenodo.org/record/3921095

The present research is emphasized on the some lithostratigraphic and nannoplankon biostratigraphic evidences between Paleogene and Neogene. The present study area is situated in the Minbu Township, Magwe Region. It lies in the north latitude (20°02´45"to 20°06´50"N ) and east longitude (94°35´20" to 94°40´05"E) fall in the topomap no.84 L/12.The Paleogene/Neogene demarcation lies between the top of lower Pegu Group (Okhmintaung Formation) and the base of upper Pegu Group (Pyawbwe Formation). There is distinct erosional surface (disconformity) at top the top of Okhmintaung Formation (Paleogene). So the lithostratigraphic evidence between Paleogene and Neogene boundary is unconformable in the study area. Some index nannofossils such as Sphenolithus conicus, S. belemnos?, S.dissimilis, S. moriformis , Helicosphera truempyi, H. ampliapeta, H. obliqua, H.euphratis, H,cateri, Discoasterdeflandrei, D.druggii, Cyclicargolithus abisectus,Cy. floridanus, Ponsphaera multipora and Coccolithus pelagicus, etc. are observed in the present study area. But, the index zone NP 25 representative species Sphenolithus ciperonsis has not been observed in the study area. : {"references": ["AUNG KHIN AND KYAW WIN. (1969). Geology and Hydrocarbon Prospects of the Burma Tertiary Geosyncline. Union. Bur. Jour. Sci. & Tech. vol. 8, p. 53 \u2013 81. BERGGEN, W. A. (1969). Rates of evolution in some Cenozoic planktonic foraminifera. Micropaleontology, vol.15, no. 3, pp. 351-365. BROWN, P.R., and YOUNG, J. R. (1998). Techniques In Brown, p.r., (ed.), Calcareous Nannofossil Biostratigraphy, Chapman&Hall,p. 16-21. BURMESE NATIONAL COMMITTEE. (1978). Stratigraphic Lexicon of Burma, International Geological Correlation Programme. p. 95-96. CLARK, D. F. (1973). Improve light microscopy techniques for viewing nannofossils. Micropaleontology. vol. 19, no.4, pp.481-484, pl.1. EAMES, F.E. (1950). The Pegu System of Central Burma, Rec. Geol. Surv. India. vol.81, 377-388. HAQ, B. U. (1973). Evolutionary trends in the Cenozoic coccolithophore genus Helicopontosphaera. Micropaleontology, vol. 19, no. 1, pp. 32-52, pls.1-7."]}