Largest Flowstone in North America, Blanchard Springs Caverns - Arkansas

Flowstones are sheetlike deposits of calcite or other carbonate minerals, formed where water flows down the walls or along the floors of a cave.[1] They are typically found in "solution caves", in limestone, where they are the most common speleothem. However, they may form in any type of cave where water enters that has picked up dissolved minerals. Flowstones are formed via the degassing of vadosepercolation waters.[2]

https://en.m.wikipedia.org/wiki/Flowstone

Damn that's pretty