A high-resolution carbonate C-isotope stratigraphy for the Aptian is presented Cau core (Spain). The biostratigraphically calibrated of used to refine previously defined segments Aptian. Thirteen have been identified and correlated, further subdivisions are presented. Correlation with other sections worldwide demonstrates robustness core. studied succession includes a continuous record early Oc...

A high-resolution age–depth profile is presented for a 16-m deep-sea piston core (EW9709-PC07) using three different methods: magnetostratigraphy, fish-teeth strontium isotope stratigraphy, and radiolarian biostratigraphy. Fish teeth are abundant throughout the core, allowing for precise age determinations by Sr isotope stratigraphy. Magnetostratigraphic ages, though not available for this core...

Carbonate-rich sedimentary rocks of the western Anabar region, northern Siberia, preserve an exceptional record of evolutionary and biogeochemical events near the Proterozoic/Cambrian boundary. Sedimentologically, the boundary succession can be divided into three sequences representing successive episodes of late transgressive to early highstand deposition; four parasequences are recognized in ...

In comparison with the amount of study undertaken on end-Permian mass extinction, preceding Guadalupian extinction has received little investigation, even though it marks a significant biotic turnover associated global environmental changes. During earlier event, reef carbonate production shut down and was replaced by siliceous, mud-rich deposits (SRDs) in South China. However, changes platform...

A Hildoglochiceras -rich horizon is reported from a thin carbonate intercalation within the siliciclastic Upper Jurassic Jhuran Formation of Jara Dome, western Kachchh Mainland. The specimens have been used for first population-level study genus based on multivariate analysis. High phenotype instability in large sample confirms occurrence transient forms between morphospecies. Key morphological...

Exceptionally well-preserved organic remains of thecamoebians (testate amoebae) were preserved in marine sediments that straddle the greatest extinction event in the Phanerozoic: the Permian-Triassic Boundary. Outcrops from the Late Permian Zewan Formation and the Early Triassic Khunamuh Formation are represented by a complete sedimentary sequence at the Guryul Ravine Section in Kashmir, India,...