Integration of the Micro/Macro Faunal/Floral Data into Ammonoid Stratigraphic Framework in the Indian Mesozoics

Abstract

An integrative mutually correlative stratigraphic framework of the Mesozoic lithobiostratigraphic successions/units is developed in the Indian sedimentary basins. It is realized on the combined strength of the stratigraphic refinement achieved in Chap. 2, together with the succession of the first- and second-order sequence surfaces formulated in Chap. 3. The exercise obligatorily involved large-scale revision and refinement of the imprecise ages of the Indian Mesozoic lithostratigraphic units which in earlier studies were based on unsubstantiated and inadequate data on different macro/microfossil groups. Also, in the process are provided new alternatives to many inaccurate intra/interbasinal correlations and models. The integration of the entire available outcrop and subsurface guide fossil-based biostratigraphic data in conjunction with sequence formulations is applied to intra and interbasinal correlation of marine with non-marine, guide fossil bearing to guide fossil devoid, along with time correspondence among ammonoid, conodont, foraminfer, coccolith, dinocyst, pollen/spore-based zonal schemes across the Indian sedimentary basins in north, west and east sectors. The chapter concludes with precise ages to the Kachchh Mesozoic units (formal formations of Stoliczka, formal members of Biswas and others, also informal/abandoned members created outside the type sections yet otherwise considered useful).