2026-04-30T20:12:29Z https://meral.edu.mm/oai

oai:meral.edu.mm:recid/2132 2021-12-13T01:39:34Z 1582963390870:1582967711045 user-uy

Marine transgression and regression in Miocene sequences of northern Pegu (Bago) Yoma, Central Myanmar Kyi Khin Myitta Neogene strata of the northern part of the Pegu (Bago) Yoma Range, Cent ral Myanmar , con ta in a series of shallow marine clastic sediments with stratigraphic ages ranging from the Earl y to Late Miocene. The studied succession (around 750 m thick ) is composed of three major stratigraphic unit s deposit ed during a major regression and four major transgressive cycles in the Early to Late Miocene. The transgressive deposit s consist of elongate sand-bars and broad sand-sheets that pass headward into mixedflats of tidal environments. Marine floodin g in transgressive deposits is associated with coquina beds and allochthonous coralbearing sandy limestone bands. Major marine regressions are associated with lowstand progradation of thick estuary point-bars passing up into upper sand-flat sand bodies encased within the tidal flat sequences and lower shoreface deposits with local unconformities. The succession initially formed in a large scale incised-valley system, and was later interrupted by two major marine transgressions in the generally regressive or basinward-stepping stratigraphic sequences. Successive sandbo dies were formed during a sea-level low stand and early stage of the subsequent relative rise of sea level in a tide-d ominated estu ary system in the eastern part of the Central Myanmar Tertiary Basin during Early to Late Miocene times. © 1999 Elsevier Science Ltd . All rights reserved. 1999 http://hdl.handle.net/20.500.12678/0000002132 https://meral.edu.mm/records/2132