after you beat the elite four, you can find they fossil in Cliff Cave. good luck!
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You get Anorith from a certain Pokemon fossil.
The Claw fossil is a fossil which contains a Pokemon named Anorith, for you to get Anorith is to take the fossil and give it to a scientist in Devon Corp. (Rustboro City). After some time he will call you and tell you to come for the Pokemon (Anorith).
Anorith
You can not get an Armor Fossil in HeartGold.
You cannot get a Skull Fossil (Cranidos) in Pokemon HeartGold.