The Coconino Sandstone layer was deposited not by ... Digging into the rock reveals that its color is actually bluish-gray. The limestone contains the fossilized remains of fish, mollusks ...

Words by Holly Bodeker-Smith· 14 Apr 2025 You don’t have to dig deep to spot sandstone, one of civilisation’s oldest building materials. The sturdy, fine-grained rock is abundant in built and natural ...