1�� Fukui Prefectural Dinosaur Museum��Katsuyama��Fukui 911-8601��Japan; 2�� Faculty of Science and Engineering��Chuo University��Tokyo 112-8551��Japan; 3�� Key-Lab for Evolution of Past Life �� Environment in NE Asia��MOEC ( Jilin University) ��Changchun��130026 China; 4�� College of Paleontology��Shenyang Normal University��Shenyang 110034��China

Fossil woods were collected from the Upper Cretaceous to Paleocene beds distributed around Heilongjang ( Amur) River area of China and Russia�� A total of 43 specimens were collected from Baishantou��Longgushan�� and Yong ��ancun in Jiayin��China��and 85 specimens from Zeya-Bureya Basin lying southeast of Blagoveshchensk in Russia�� Selected specimens were sectioned and studied anatomically�� The source deposits of almost all identifiable specimens belong to the Upper Cretaceous ( Campanian) Taipinglinchang Formation and the Paleocene Wuyun Formation in China��and the Paleocene Upper Tsagayan Formation in Russia�� Although the results obtained are still far from complete��the taxonomic composition of the fossil woods show marked stratigraphic differences between the two horizons beyond the K/T boundary in China�� There is also a strong similarity in wood flora between the Wuyun Formation of China and the Upper Tsagayan Formation of Russia�� All identified specimens from the Taipinglinchang Formation are Xenoxylon latiporosum�� This is one of the stratigraphically younger records of Xenoxylon��which is a conifer morphogenus of uncertain affinity most common in the Triassic to Early Cretaceous�� Only one specimen with possible derivation from either the Wuyun or the Maastrichtian Furao Formation in China was identified as Taxodioxylon sp�� The Wuyun Formation yielded both conifers and dicotyledonous woods�� The conifers include Taxodioxylon sequoianum of the Taxodiaceae��and Protopiceoxylon amurense��which is attributable to the extant genera Keteleeria or Nothotsuga of the Pinaceae�� both are at present endemic to China�� At least two morphotypes of dicotyledonous woods were recognized��with one identified as cf�� Hamamelidoxylon ��and the other diffuse porous wood is characterized by numerous heterogeneous rays�� From the Zeya-Buleya Basin of Russia��Taxodioxylon sequoianum and cf�� Hamamelidoxylon sp�� were identified from the Upper Tsagayan Formation�� The similarity of wood composition in both Wuyun and Upper Tsagayan Formations support lithological as well as biostratigraphic correlations proposed for the two formations��