By the time Senku came across Dyme, he'd already outfitted himself with a stone axe and a stone knife that was hanging from a makeshift rope belt off of his cargo pants. He'd also torn up one of his t-shirts to make wrist bracers, meaning he's been busy.

"Find any interesting shells?" He asked, a lot less interested in the pretty ones and more what they were made of.

A source of calcium carbonate would not be amiss.