The Amur (called Heilongjiang or "Black Dragon River" in Chinese ) forms the border of Russia and China , and is near where this dinosaur's remains were found . riabinini ), named in honor of the late Russian paleontologist Anatoly Riabinin , who conducted the first Russian expeditions to recover dinosaur remains in the Amur region in 1916 and 1917 . The sediments were laid down in the floodplain of a river , which transported the fossils, but only a short distance, judging by the randomly assorted, disarticulated, but well-preserved bones within the bonebed, including fragile skull elements . Only a small section of the bonebed has been uncovered, but 90% of the remains found so far belong to lambeosaurines like Amurosaurus , mostly juveniles, with the rest belonging to other taxa, such as the hadrosaurine Kerberosaurus . However, most of the other bones of the skull and skeleton have also been preserved in the bonebed, albeit of many different individuals .