Stone that keeps time. A cave column is a ledger of dripping water — one thin ring of calcite left behind every hundred years or so.
Nothing here is carved. A speleothem is what a limestone landscape does with rain, slowly, in the dark. Follow a single drop from the surface to the cave floor and back into rock.
Water turns acid
Rain soaks through soil and takes up carbon dioxide, becoming a weak carbonic acid — sharp enough to eat stone.
Acid dissolves limestone
Underground, that acid pries calcium carbonate out of the bedrock and carries it away, held in solution.
The drop lets go
At the cave roof the drop meets open air, breathes its CO₂ back out, and can no longer hold the calcite it carried.
A century, a millimetre
The straw thickens into a stalactite; the splash below answers with a stalagmite. Given enough drips, they meet.
A stalactite and a stalagmite are the same debt paid twice — once by the drop that leaves, once by the splash that lands. Watch long enough and the two towers of the same water close the gap between them, ring by patient ring.
- What the counter reads
- The clock runs in millennia, not seconds. Each drip you see stands for roughly a century of deposition — so a few minutes here is tens of thousands of compressed years.
- Second look
- Now and then a drop carries a fleck of iron from the soil above. It lands warmer in colour and lower in pitch — one rust-stained century in a column of pale ones.
- The join
- When tip meets tip the two become a single pillar and the dripping moves on down its flank. On your visit the column is still a few centuries short of closing.