This so-called flood layer does not exist worldwide. In fact I don't know of any single spot on Earth where such a sequence exists.
If such a sequence does exist anywhere on Earth, please name the exact location so I can perform a literature review to determine if it does actually meet the necessary criteria.
The region of Mesopotamia has evidence of past flooding. I don't know if this has what you are looking for, but this is the region where the Biblical story does take place.
I believe there was a flood. Regional, yes. Global, no.
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