Analysis thumb|left|upright=1.15|500 million years of climate change vs. 18O|alt=Time evolution of oxygen-18 concentration on the scale of 500 million years showing many local peaks.
Analysis thumb|left|upr.ight=115|500 million years of climate change vs. 18O|alt=Time evolution of oxygen-18 concentration on the scale of 500 million years showing many local peaks.