hardened to

Ediacaran animals, which lived 635-538 million years ago, were ocean dwellers; their remains preserved as cast-like impressions on the seabed that later hardened to rock.

Many of the formations are Jurassic sand dunes that have been hardened to sandstone by time.

Their total reform package — still being hashed out — potentially includes requiring insurers to cover more high-risk properties, especially homes that have been “hardened” to reduce fire danger.

Many of the formations are Jurassic sand dunes that have been hardened to sandstone by time.

Others, fabricated from translucent amber resin that has hardened to a glossy sheen, are low and horizontal, oozing and puddling across the floor like pools of blood or toxic spills.