The limonitic layers have high concentration of iridium (650 to1333 pg/g) and osmium (650 to 2230 pg/g) compared to less than 100 pg/g measured in other horizons of this pit. Based on the geochronological, geochemical, palaeomagnetic and palaeontological data [3,4], it has been shown that the limonitic layers were deposited during the KPB event. The deposition rate of sediments in the intertrappean bed is much higher than in the contemporaneous marine sections, and therefore they offer a better time resolution, allowing a high-resolution sequence stratigraphy of K/T transition events and their relation to Deccan volcanism to be constituted