So the preservation and the survival of DNA depends on many factors, and I have to admit, most of which we still don't quite understand, but depending upon when an organism dies and how quickly he's buried, the depth of that burial, the constancy of the temperature of that burial environment, will ultimately dictate how long DNA will survive over geologically meaningful time frames.
DNAの保存状況と 残存状態は 多くの要因に依存します 要因の詳細は まだよく分かっていませんが 生物がいつ死んだか すぐに土に埋もれたか どのくらい深く埋もれたか 埋もれた環境の 温度が一定かどうか それらの要因が 地質学的な時間枠の中で DNAの寿命に影響します