hooberus -
Uniformitarianism is a principle of Geology for sure. However it is not left to the assumption that this principle is true (Hutton, like Darwin..., lived in the 19th century and we have learnt a lot more since then and proven a lot of the assumptions that were initially made by the pioneers in science) when working out ages of strata and considering geological features such as unconformities. Such ideas that these formations could have formed in months is ludicrous for many reasons.
Consider an angular unconformity where the underlying strata is at a different angle to the layers above. The only way that could happen is if the entire formation under the unconformity were to have been tilted. The does not happen on the surface (and if it did the energy needed would destroy the entire rock formation instead of tilting the various strata in situ).
You also left out subduction in your 'explanation'. This is the process where those sedimentary layers sink lower into the crust due to the build up of layers upon them. When they are deep enough they are then lithified due to the pressure and temperatures that they encounter at such depths (the pressures and movements so deep in the Earth also twist and turn these strata...). After a long while the environment changes and the area of overlain strata then experiences a period of erosion and when the upper layers disappear this allows the older layers to raise back up to the surface (the crust floats on the mantle...).
Geological features that occur under flood conditions do not cause unconformities of the nature you describe. Geological features of the sort required for a global flood would be very easy to find. There are none.... However we have got evidence of a massive asteroid strike from around 65 million years ago. A strike that hit a small part of the world yet left traces of the resulting explosion all around the world.
Consider:
1 - An asteroid hitting the Earth just off the coast of South America leaves evidence in the rock formations all around the globe.
2 - A Global flood that buried the entire Earth under water leaves no trace at all.
Which is the myth?