Tracking temporal palynofloral changes close to Cretaceous-Paleogene boundary in Deccan volcanic associated sediments of eastern part of central Deccan volcanic province

Deccan volcanic sequences （DYS） in the central Deccan volcanic province （CDYP） are designated as Sahyadri Group having -500 m thick lava pile associated with multiple sedimentary beds at different strati-graphic levels. In the eastern part of CDYP between the latitude 19°55-20°25 ′N and the longitudes 78°15-78° 30′E, palynological investigation of the intertrappean sedimentary beds at five stratigraphic levels was carried out. The study was basically aimed for tracking the floral and environmental changes across the Deccan transi-tion. The resulting finds indicate that the intertrappean sediments at the lowest stratigraphic level between the earliest lava flows are characterized by presence of marker Maastrichtian palynomorphs - Gabonisporis vigour- ouxii, Aquilapollenites bengalensis, Azolla cretacea and Farabeipollis associated with triporate and tricolpate pol-len grains, phytoliths of Oryzeae of Poaceae family and peridinoid dinoflagellate cysts. The increasing volcanism deteriorated the existing flora as evident by absence of pollen-spores and presence of only structured biodegraded organic matter, fungal spores, acritarchs and algal （Botryococcus） remains in the sediments of higher-up in the sequence. For chronostratigraphic constraints on the lava flows magnetic polarity of the flows bracketing the in-tertrappean beds was investigated. The results indicated presence of N-R-N-R magnetic polarity in the basal la-va pile that are interpreted as representing the magnetochron C30N to C28R （ Maastrichtian-Paleogene）. The floral change begins with the onset of volcanism in the chron C30N and floral deterioration is observed in C29N with increasing volcanism and it is only in the chron C28 R （ Danian） that some evidence of recovery of flora is recorded. The current study shows that in eastern part of CDYP the post Cretaceous-Paleogene boundary erup-tions represent the main phase of eruptions that triggered deterioration of the flora.

Boundary of Cretaceous and Paleogene continental deposits in Zeya-Bureya Basin,Amur(Heilongjiang)River region

It was conducted the comparison of palynological assemblages of the Middle Tsagayan,Upper Tsagayan subformations,Furao and Wuyun formations from Zeya-Bureya Basin of Amur (Heilongjiang) River region with assemblages obtained from the marine deposits of Northeast Russia,Sakhalin,Kuril,and Hokkaido Islands,dated by ammonites,foraminifers and other invertebrates. Based on detail correlation,the geological age of the terrestrial beds was defined. The guide fossils are recognized Marsypiletes cretacea,Tricolpites variexi- nus,Aquilapollenites conatus,A. stelkii,A. rombicus,Integricorpus bellum,Pseudointegricorpus clarireticula- tus,Triprojectus amoenus,Orbiculapollis lucidus,Wodehouseia aspera,Quercoidites minor,which had last oc- currence in the late Maastrichtian. The Danian palynofloras usually are dominated by Triatriopollenites plicoides and T. confusus. The species Anacolosidites subtrudens,Aquilapollenites proceros,A. spinulosus have last occurrence in the Danian. The K-T (K-Pg) boundary in the terrestrial deposits is defined in the base of the Upper Tsagayan Subformation and the base of the lower part of the Wuyun Formation. The latter is represented by aleuropelite to fine-grained sandstones. The change of taxonomical composition of palynospectra in similar environments could be determined by real change of flora at the Mesozoic and Cenozoic boundary,but not by changes of lithological facies or depositional environment,generally.