The big creationist explanation for the rock layers are semi-natural. I use to agree with this. But after looking for myself.... this is not what my eyes are telling me. Why are we looking for a natural explanation to an event we know to NOT be natural??
That really depends on whether you are talking a Young Earth Creationist or a Progressive Creationist. Progressive Creationists, though rejecting biological evolution still adhere to the Lyellian doctrine of uniformitarianism which is a major tenet of Darwinism which teaches that all of the geologic formations and fossils we see today were formed over a long period of time. They believe that most of the geologic formations we see today were formed by an act of nature instead of a supernatural act.
Young Earth Creationists, who accept the Genesis account of creation as actual history, believe that the vast majority of the geologic formations we see were formed supernaturally via the flood of Noah and that which was not an act of the global flood was due to a lesser post catastrophic event.
Those professing Creationists who hold to some of the tenets of Darwin and attempt the impossible task of harmonizing them with scripture have relied too much on science, which is the study of the natural world as it presently is, to explain a past event, including that which is supernatural.
Science was only meant to explain the present workings of the natural world. It was not intended to present a historical record of past events, nor was it meant to explain supernatural events. It is the study of the present natural world by which discoveries have been made which have led to the harnessing of electricity, advancements in medicine and medical technology, the illumination of our homes with light bulbs, that have led to the invention of swift modes of transportation such as planes, trains, and automobiles, that made way for faster means of relaying information and the spreading of knowledge such as the printing press, telephones, radio, television, computers, the internet, e-mail, and social media, which have sent satellites into space, have placed men on the moon, and which led men like Sir Isaac Newton to define the law of gravity.
Darwin had nothing to do with any scientific discoveries and advancements from which we benefit. He only popularized and refined a philosophy pertaining to the origins of life which has never been observed or replicated. Scientific discoveries and advancements were being made before Darwinism was ever conceived or embraced and have continued, not because of him, but in spite of him.
The sooner the Church acquires a proper understanding of what science is and what it is not, the better able it can be seen that scripture and science do not conflict with each other. If there is any science that is at odds with the scriptures, then it is not a science but a pseudo-science because true science never has, nor will it ever present any discovery contrary to the divinely inspired and inerrant Word of God.