Where to find oil in Civ5? [duplicate]

After I researched Biology I found 2 sources of oil and after that turn the oil signals dissappeared and i dont know where these sources are. How i can identify them ? I have a World like map and i have all America dominated.

Thanks

1

1 Answer

Oil is a strategic resource in Civilization 5 that can be found on Desert, Snow, Tundra or Coast. You need to make an oil well on land to get at it or an offshore platform to get at it on the sea.