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Sedimentology of the Sitha Formation in the Sedaw–Kyaukchaw Area, Patheingyi and Pyinoolwin Townships
- The Sedaw-Kyaukchaw area forming a part of the western marginal zone of Eastern Highland lies to the east of the central Myanmar Tertiary Basin and is situated about 25 kilometers southeast of Mandalay in Patheingyi and Pyinoolwin Township. Sitha Formation is well exposed at the east of Sedaw- Kaiktan village as distinct as Sedaw scarp line, especially between first and third Reversing on Mandalay-Pyinoolwin railway station. Sitha Formation is mainly composed of massive, thick-bedded, thin- to medium-bedded, bluish grey limestone with irregular silt partings. Primary sedimentary structures chiefly planar and trough cross stratification of small to medium scale, hummocky cross stratification and planar bedding are also abundant. Therefore seven lithofacies and six microfacies are studied. According to the lithofacies and microfacies characteristics, indicate that the Sitha Formation was deposited warm shallow marine, subtidal and intertidal environments. The occurrences of the various types of stromatolites and oncoid structures are also abundant and characteristics, especially the 1st reversing and northern part of the Sedaw Chaung. These structures are also characteristics in the middle Ordovician sequences of the Wunbye Formation of the Southern Shan State. Although it needs to be study more, the two Formations of the Northern Shan State and Southern Shan State can correlate not only stratigraphy but also their depositional facies.
Khin Khin Lin
- Universities Research Journal