Introduced: 1969
Manufacturer: Post
Sugar Per Serving: 11g
Watch A Classic Commercial:

The fact that this cereal is named after prehistoric rocks should tell you something: Clearly, it must be delicious to have survived all these years. Or, that people will eat anything chocolate, particularly if it's marketed by Fred Flinstone.

Bonus points: Post-consumption, you were essentially left with a bowl of chocolate milk to drink.