To get the Hidden Cash Achievement.
This is where you find the hidden cash of Moneda in the Mesozoico Special Missions.
Quickly run to the area where you find the PG-240.
The key is by the big dinosaur skull, pick it up and head out of the building.
then head up the left pathway to the big pterodactyl .
The chest is behind that statue.
You can watch my video for help.
Thanks
KP