formations claimed to be millions of years old.
Claimed? The process that creates stalactites and stalagmites is well understood and established in all universities all over the world from USA to Russia to China to Germany, to every country that has department of Earth science and mineralogy. The only problem with the process exists with a population in region that was visited by Sherman in 1864-65. There is a difference between limestone creation in enclosed cave system and man-made structures where mineral is gypsum . It involves different chemistry, mechanics, and physics (chemical composition, acidity of the rainwater, cave humidity, etc).
Perry is the definition of confirmation bias.
So far Young Earth believers were not able to prove that the Earth is indeed 7000 years old.
actually learn about the subject
Of course, but it would involve to really take science classes and do actual work with the apparatus. It is different from the faith-based beliefs. To him it is easy to compare goat and table. Both have four legs, so they must be similar.