博客提及时间节点错误，需关注第4段开头，指出第3段阐述证据，第4段进行解释。还提到多数古老生物灭绝，少数存活，石膏层上下沉积物含海洋化石，表明是开放海洋环境。
14
时间节点错
注意 看第4段开头,
It's like this the paragraph 3 illustrates the evidence while paragraph 4 severs as an explaination
2
Most of the older organisms were nearly wiped out, although a few hardy species survived.
4
Sediment above and below the gypsum layer contained tiny marine fossils, indicating open-ocean conditions.
8
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