Creationists must continue to study these issues biblically and scientifically. Many creationists fail to comprehend this concept. The formation of rocks by normal process is denied by these creationists, and a miraculous creation of these things is demanded by default. Limestones in the Grand Canyon, for example, could not have been caused by the flood unless it was created as a miracle by God. Floods cannot produce chemically-precipitated rocks like limestones.
Floods only produce clastic deposits like mud.
Whether these creationists assume this position of miraculous formation deliberately or through ignorance is irrelevant to the discussion. Such a position can be taken and used to defend the tradition that the earth was created a short time ago. If one's theology depends upon a particular age one must assume the above. My understanding of the Bible and God places no restrictions upon God time-wise. For this reason, I can accept the scientific explanation of limestone.