Age and cause of death for two remains of finless porpoise(Neophocaena phocaenoides asiaeorientails) found at the estuary of the Yangtze River

Abundant chipped stones and animal remains from the layer of the Neolithic Age provide important materials for discussion on natural environment, food recourses and economical type in that period.

Stability of diatom remains and their implications for forming environment.;