The formation containing the cave I’ve been discussing is the Arbuckle limestone, which was deposited during the Ordovician, when there was plenty of marine life, but not yet land vertebrates. Its limestone and dolomite is the product of creatures such as gastropods, echinoderms, bivalves, and stromatolites which inhabited tidal and shallow sea regions over a period of elevated sea level during the first of the recognized major sedimentary sequences, the Sauk.
Geological studies have placed the Sauk sequence as an interval of a hundred million years or so. The megasequence terminology, but decidedly different meaning, have been appropriated by YEC to designate phases of Noah’s flood spanning a few weeks or months, so reduced by a factor of a billion. One of many details they gloss over, is that the stable isotopic ratio for the carbon, strontium, and oxygen making up the formation, display trending variations. There are various drivers for this which can play out over geologic time. However, in a scenario of rapid deposition in a matter of weeks under turbulent conditions, there is no real plausible explanation for any sort of variation.