One of the easier YEC arguments to refute is the claim that marine fossils on mountains are proof of a global flood. SEfaGF asserts:
Marine fossils can be found on the crests of mountains. Apart from mountain uplifting, this can also be explained as the marine animals being washed there and then buried. A global flood could do this.
No, it could not. Marine fossils are found on mountains due to uplift from plate tectonic activity, as SEfaGF reluctantly acknowledges. There are many flaws in the YEC assertion, but arguably the most devastating is the fact that when the flood waters receded, the dead animals would also be dragged back by the strong currents, and be deposited at the base of such mountains. We do not see this, and just on this point, the YEC claim about a global flood is shown to be nonsense.