Ichnology:The study of past-depositional biological effects on sedimentary deposits
目的:知道生物的自然行為由此解釋地層層序生痕化石的意義，
誰在何種情況下造成那些行為的結果
(次重要) (重要)
1. reconstructing paleoenvironments
2. trace foddils areall in situs : never neworked
3. trace fossils in some environments are more abundant than body fossils
4. complete trophic structures are recorded by trace fossils
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