Almost any fossil can be received from the worker after the old amber, you just happened to get that first. He will give away a random fossil every day except for the new bird and turtle fossil Pokemon.
In Pokemon LeafGreen, the Dome Fossil can be revived into Kabuto, and the Helix Fossil can be revived into Omanyte.
Neither the Helix Fossil nor the Dome Fossil will become an aerodactyl. In order to obtain an aerodactyl you must revive a pokemon from the Old Amber item which can be obtained in the Pewter City Museum.
Aerodactyl
Answer:If you mean in Pokemon, there is no other fossil like it, and it becomes an aerodactyl.
Restore it by fossil when you break rocks in the Glittering Cave
Im pretty sure you dont catch aerodactyl in heartgold but I think you can get him as a fossil, if you do, talk to the guy in the pewter city mueseum and he will turn it into aerodactyl for you.
it is the old amber, look under ground.
An old amber is the fossil if you like for aerodactyl.
From the Skull Fossil, you get Cranidos. From the Armour Fossil, you get Shieldon. From the Claw Fossil, you get Anorith. From the Root Fossil, you get Lileep. From the Helix Fossil, you get Omanyte. From the Dome Fossil, you get Kabuto. From the Old Amber, you get Aerodactyl. Courtesy of Josh, England.
First you need to get the Old Amber (a type of fossil). Then you go to pewter city museum and ask the guy and then he'll make the Aerodactyl for you.
Get a old amber and take it to a guy in the museum in Petwer City,
Helix Fossil - Omanyte Dome Fossil - Kabuto Old Amber - Aerodactyl Root Fossil - Lileep Claw Fossil - Anorith Skull Fossil - Cranidos Armor Fossil - Shieldon -------------------------------------------