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史上有过一个案例,我们发现什么似乎是一个史前化石,但没有办法约会吗?

我发现,当我学一个新的化石,化石总是说提到的时代。这个困扰我鉴于直觉罕见迄今似乎有放射性物质的形成。我知道,古生物学家也使用其他化石形成日期新化石然而肯定有情况下,我们发现新化石,我们没有办法知道年龄吗?

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是的它发生,我们知道什么时候和为什么会发生。- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1。* *坏集合。* *最常见的原因是由于糟糕的收集方法。有时非专业人员收集化石没有记录,或当他们收集,在这些情况下化石没有普罗维登斯,为科学分析通常是无用的。只要你知道岩层化石来自一个窗口的时间从何而来。顺便说下这是为什么一些古生物学家绝对厌恶私人收藏家,因为经常导致这些无用的化石。而通常你至少可以得到一个粗略的想法通过比较类似的化石,但有时化石是严重受损甚至这样做。2。* * * *的运气不好。 Occasionally fossils are collected properly and because of unusual circumstances (say a museum being bombed in a war) collection data is lost and a fossil again becomes useless because it has no providence, this is one reason collection are encouraged to be recorded in detail in multiple locations. This happens often with fossils collected in the early days of paleontology when record keeping was often of lower quality. 3. **Bad actors**. Sometimes a private collector engages in outright fraud, this most often happen in private collectors who want to make a fossil more salable. Often this evolves sticking the fossil in rock from a different formation or combining multiple different fossils into a single fraudulent piece. this is another reason many paleontologist dislike private collecting as it can encourage sellers to purposefully destroy a fossils providence. It is usually fairly easy for an experience paleontologist to spot such frauds but private buyers often cannot. 4. **Bad Luck again.** There is one other circumstance, rarely you have reworked material, that is fossils that where exposed by erosion in the distance past then reburied, This is exceedingly rare, and always leaves its mark on the fossil, in that case we know the fossil is in the wrong place but may not know exactly where and thus when it comes from originally. Usually you can identify by finding similar fossils, but rarely the fossil so badly degraded identification is impossible. [http://preparation.paleo.amnh.org/35/techniques-in-the-field][1] [https://www.nature.com/articles/512371c][2] [1]: http://preparation.paleo.amnh.org/35/techniques-in-the-field [2]: https://www.nature.com/articles/512371c

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