Petoskey is actually fossilized coral.
The rock is called coal.
The rock is......Coal
Asphalt is not a rock, but is produced from the remains of fossilized organisms.
When a dinosaur died, sometimes its bones became fossilized (turned into rock). We can find those fossilized bones today.
The fossilized ripples tell us about the environmental conditions when the rock was formed
Fossilized; hardened; rock-hard; immobilized. Petrified also means extreme fear.