1． Key-Lab for Evolution of Past Life，MOEC，( Jilin University) ，Changchun 130026，China; 2． College of Paleontology，Shenyang Normal University，Shenyang 110034，China; 3． Geological Institute of RAS，Moscow 109017，Russia; 4． Institute of Biology and Soil Science，FEB RAS，Vladivostok 690022，Russia; 5． Institute of Geosciences，University of Tuebingen，Tuebingen 72074，Germany; 6． Royal Belgian Institute of Natural Sciences，Dept． of Palaeontology，B － 1000 Bruxelles，Belgium; 7． Amur Natural History Museum，IGNE FEB RAS，Blagoveschensk 675000，Russia; 8． IVPP，Beijing 100044，China; 9． Research Center of Paleontology ＆ Stratigraphy，Jilin University，Changchun 130026，China; 10． Komarov Botanical Institute，RAS，St． -Petersburg 197376，Russia; 11． College of Geoexploration Science ＆ Technology，Jilin University，Changchun 130026，China; 12． Amur State University，Blagoveshensk 675000，Russia; 13． Denver Museum of Natural Sciences，Denver CO-90205，USA; 14． Chuo University，Tokyo 112，Japan; 15． Indiana University，Bloomington，IN 47405，USA; 16． School of Ocean ＆ Geosciences，University of Southampton，Southampton，SO14，3ZH UK

An international cooperative study of the Late Cretaceous biota and non-marine strata including the Cretaceous-Paleogene ( K--Pg) boundary in Jiayin near the Heilongjiang River，China during 2002-2010，is summarized in this paper． The strata includes the Upper Cretaceous Yong'ancun-，Taipinglinchang-，Yuliangzi-， and Furao formations，and the Paleocence Wuyun Formation consisting of Baoshantou Member and a Coalbearing Member． Seven palynological assemblages from Santonian to Paleocene are recognized，which is used for definition of the K--Pg boundary． Through the palynological analysis of three drilled boreholes ( XHY-2005， 2006，2008) in Xiaoheyan of western Jiayin，the K--Pg boundary is defined within 20. 00-20. 05 m in the borehole XHY-2006 ( as a standard boundary) which is just between the top of Furao Formation ( late Maasterichtian) and the base of Baishantou Member ( early Danian) ． These new research results are supported by paleomagnetic， geochemical and other analyses，also． On the other hand，the presence of eight taxa of Maasterichtian dinosaurs ( mostly hadrosaurids) have been recognized by the authors; and two mega-plant assemblages from the Yong'ancun Fm ( Santonian) to Taipinglinchang Fm ( Campanian) are confirmed． These research achievements indicate that the Upper Cretaceous-Paleocene in Jiayin can be well correlated to the strata in the neighboring Zeya-Bureja basin，Russia． The K--Pg boundary definited in Jiayin is the first well documented non-marine K--Pg boundary in China． Also the related paleoclimate，paleoenvironment and the mass extinctions in this area during the Cretaceous-Paleocene transition are also discussed．