We have a collection of predictive testable hypotheses which authenticate physical evidence of Noah's flood with the account in scripture. In science a collection of hypotheses which support a premise is called a theory.
The Theory of Noah’s Flood
Hypothesis 20
Our prediction is that there was a mass extinction of marine life during Noah's flood. The test is the stratigraphic evidence of a world-wide anoxic extinction. That's a scientific hypothesis.
Cenomanian-Turonian
A world-wide anoxic extinction event above the Cretaceous/Tertiary boundary is a logical outcome of the worlds ecosystems decomposing in the waters of Noah's flood.
August 20th
A world-wide anoxic extinction event above the Cretaceous/Tertiary boundary is a logical outcome if the worlds ecosystems were decomposing in the waters of a year-long world-wide flood.