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"The Golden Age
Catastrophe! The Earth evolves, along with humans and animals.
Everyone has the Stone, or if they don't then they don't need it. Everyone is truly happy. No one needs any rules or technology. There is no such thing as money. Truth and Nature is obvious. Everyone is very spiritual. Good times!
The Silver Age
Catastrophe! The Earth evolves, along with humans and animals.
Everyone has the Stone. People are mostly happy. People start developing advanced technology. This is the age of technology. There is no need to work still, but people like inventing things. Ownership of property starts, which causes problems and by the end there are wars.
The Bronze Age
Catastrophe! The Earth evolves, along with humans and animals.
The survivors keep the Stone away from the new (evolved) humans and call themselves gods. They build cities and rule the new humans. There is still some technology which the "gods" keep for themselves. The "gods" decide gold and silver are to be the currency, since they can easily produce these two metals and the new humans cannot. People are happy half the time.
The Iron Age
Catastrophe! The Earth evolves, along with humans and animals.
The "gods" are dead now or hiding. The technology is mostly lost. The Stone is kept very secret by the few who manage to retain the knowledge. People start to care about money more than anything else. The people can't live without rules, but good rulers are few and far between. People are depressed and lose the ability to comprehend truth, preferring to believe their own lies. In the very latter part of this time, as the Iron Age is starting to pass into the Golden Age again, technology starts to develop. But this is only temporary and does not develop properly due to the best technology being kept secret, and the fact that the people can't understand nature. At the end of the Iron Age, the Stone is rediscovered and released back into the world, which is the catalyst causing all secrets to be released and ushers in the Golden Age."