Because one formation of layered sediments formed in a day, that does not therefore mean that all layered sedimentary formations were formed in a short timeframe. And quick burial is required for most terrestial fossils - but many oceanic fossils do not require such - indeed, many limestones are almost entirely composed of coral fossils, such as those forming Guadalupe Peak in Texas (a huge fossil reef complex). And many key indicator fossils - fossils found within a predictable timeframe and across wide parts of the globe - are often hard-shelled microorganisms such as foramnifera that will fossilize whereever they are deposited.
Has geology in the past understated catastrophism as a agent of geologic change? Yep. Does that therefore give a boost to creationism? Nope - just as the shift from a geosynclynic model to a techtonic model for mountain building, something far more profound, did nothing to prove creationism.