In a relatively brief period the archaeological record is reduced to mere scraps of stone, bone, glass, metal, and earthenware.
在短时期内，能留下考古记录的东西也都会退化为石头、骨头、玻璃、金属和陶器的碎片。
2
Some scientists suspect that the collagen comes from bacteria rather than dinosaurs, but others are investigating collagen as a way to bar-code scraps of unidentifiable bone.