What is testable (among other things):
1. Measuring the before and after conditions of local flooding (i.e. deposits)
2. Rate of sedimentation.
3. The ability or inability to create sedimentary rock (i.e. pressures & temperatures, etc.)
4. How run-off water forms tributaries above ground and under water.
5. Rate of erosion of soil and of rock (including the smooth rocks in a riverbed)
6. Rate of deposition of diatom shells
So, based on the above, interested folks can (to a limited degree) backtrack a series of event explanations to get from current condition to historical Earth configuration that we observe in the many formations around the world.
The problem is, Creationists have spot explanations that are not tied together, and have no desire to explain strata and other conditions in any level of detail that is backed-up by the tested observations (see above list) of geologic change. It all comes down to the Bible says it and the case is closed. Something is buried here and over there, therefore the Bible's global flood occurred.
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