The Latest Cretaceous Flora of Heilongjiang Province and the Floristic Relationship Between East Asia and North America (Cont.) Oxalis jiayinensis, a new species of the Late Cretaceous from Heilongjiang, NE China Fossil Woods from Late Cretaceous of Heilongjiang Province, Northeast China, and Their Palaeoenviromental Implications Advance in quantitative explanation of patterns and processes of terrestrial ecosystems since the Late Cretaceous