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The time periods of the Paleozoic and Mesozoic are subdivided into early middle and late instead of named epochs as they are in Cenozoic periods is due to the basis of the occurrence of particular fossils. It is also based upon the absence or appearance of geological horizons.
Periods.
Seven Billion
groups go vertically and periods are the horizontal rows
One million divided by seven = 142,857.143
Seven thousand million divided by three hundred million equals 23.33
Thirty seven billion divided by fifteen million is 2,466.67
Seven thousand (7000).
7000000 / 48 = 145,833.33333
141000000 / 7000000 = 20.14286
0.72
2333.33333333333333333333333333333333333333333333333333333
3,500,000
0.3143
77000000000 / 40000000 = 1,925
25,500