1. Department of Earth Sciences, Okayama University, Okayama 79928530, Japan; 2. Department of Earth and Planetary Sciences, Kyushu University, Fukuoka 81228581, Japan; 3. Research Center of Paleontology and Stratigraphy, Jilin University, Changchun 130026, China; 4. Paleontological Institute of Shenyang Normal University, Shenyang 110034, China

The Jiayin area along the Heilongjiang River in Northeast China has attracted stratigraphic and sediment-ological interests recently because the Cretaceous��Tertiary (K/T) boundary should be located in this non-marine succession. Dinosaur remains disappear suddenly at the upper part of the Maastrichtian, whereas plants gradually evolved throughout the succession. Analysis of sedimentary facies has been carried out and paleo-environments through Upper Cretaceous to lower Paleocene sections are reconstructed. Fluvial to lacustrine sedimentary environments are inferred from the facies. Several debris flow events have been identified, and it is in these deposits that the dinosaur fossils are concentrated.