Sequence stratigraphy of Late cretaceous sediments of Ariyalur pondicherry sub basin Cauvery basin india

Abstract

newlineThe Cretaceous system of Cauvery basin consists of an exceptionally newlinecomplete shallow marine sequence with rich faunal succession of Albian newlineMaastrichtian age These Cretaceous exposures are represented on the coastal newlineplain of Tamil Nadu in the districts of Ariyalur Vridhachalam and newlinePondicherry Extensive studies have been carried out for more than a century newlineto study the Cretaceous rocks of Cauvery basin particularly of the Ariyalur newlinearea which affords the best and most complete representation of the newlinesuccession Earlier studies were focused mainly on lithostratigraphic newlineclassification and description and biostratigraphic studies Cauvery basin has newlinehorst graben morphology and comprises of several depressions separated newlinefrom one another by subsurface ridges Ariyalur Pondicherry sub basin is the newlinenorthern most depression of the Cauvery basin It is a linear feature aligned newlineNE SW and extends in to the offshore This research work has been carried newlineout in an attempt to develop the sequence stratigraphy of Late Cretaceous newlinesediments of Ariyalur Pondicherry sub basin newlineLate Cretaceous well cutting samples at 5m interval have been newlinecollected from three subsurface wells namely SS 1 SS 2 and SS 3 located in newlinethe Ariyalur Pondicherry sub basin Equivalent outcrop exposures around newlineTrichinopoly have been studied for the purpose of correlation with subsurface newlinedata newline