[qam1]

If the flood killed the animals of earth, their remains would be deposited in a single flood layer.

The same would be true if a meteor killed the animals, their remains would be deposited in a single meteor layer like the K-T Boundary.

There is no such "kill" layer.

All dinos but one were long gone by the K-T Boundary and that one, a species of Hardasaur lived another 700,000 years past it.

The fossil record of the Permain shows a similar gradual extinction.

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Foraminifera.