Periods of increased glaciation
ice ages
rings
volcanic eruptions
sun spots
fossils
(for people who don't know)

ICE AGES is the periods of increased glaciation.

Ice age was the popular term that referred to the recent glacial period which happened around 110,000 - 11,700 years ago. 

Ice age is characterized by the long-term decrease of temperature on earth and its atmosphere. Continental and polar ice sheets,as well as, alpine glaciers expand during these periods.  

Except common history

Answerstratovolcanoes///near or in the ring of fire;