Some cave dripstone assemblies, such as those in Carlsbad Caverns, are mainly round in cross section, with some platy shapes; however, these were almost uniformly flattened. I’m not sure to what extent the climate above regulates their shape, since Carlsbad lies under subtropical semi-desert, whereas northwestern Thailand’s Chiang Dao is natively a tropical rainforest. Regardless of those differences, overhead limestone of similar Permian age has been dissolved and reconstituted along driplines underground, drop by drop, for millions of drops and many millennia.
Chiang Dao, Thailand (24 Jan 25) Underground
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