If there really was a worldwide flood, it's a good thing to think about it's impact (which strata were formed by it) and about the processes involved.
It seems logical to take into account cosmic events, like the impact of meteorites and/or comets. Even high age geologists generally assume the impact of at least one large meteorite (on land) and a comet (in the sea).
A worldwide flood
Many observations support the idea of a global flood being reponsible for most strata. Most strat were formed under water and we know that strata clusters can be formed very quickly - like after the eruption of Mount St. Helens in 1980.
Flood geologists have suggested different models and it's not easy to decide which is the right one - the scale is so much larger than what we are familiar with. We also cannot be sure which strata were formed during the Flood and which are from a later date (catastrophes). So let's be modest about it!
Out the different flood models I take one example. Some consider this one as the best. So maybe something like the following happened:
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