CO2 concentration derived using Zachos data
   Time(My)  CO2(ppm)
     .2500     304.4
     .7500     309.2
    1.2500     330.4
    1.7500     336.7
    2.2500     346.8
    2.7500     366.3
    3.2500     393.3
    3.7500     403.6
    4.2500     410.4
    4.7500     404.5
    5.2500     422.6
    5.7500     408.4
    6.2500     421.4
    6.7500     427.5
    7.2500     427.2
    7.7500     430.0
    8.2500     423.4
    8.7500     429.3
    9.2500     429.9
    9.7500     439.0
   10.2500     445.9
   10.7500     456.9
   11.2500     457.9
   11.7500     465.1
   12.2500     475.4
   12.7500     479.5
   13.2500     509.4
   13.7500     516.6
   14.2500     561.1
   14.7500     582.5
   15.2500     588.6
   15.7500     572.8
   16.2500     567.5
   16.7500     555.9
   17.2500     510.0
   17.7500     513.6
   18.2500     522.4
   18.7500     511.3
   19.2500     495.8
   19.7500     520.3
   20.2500     543.9
   20.7500     524.4
   21.2500     535.7
   21.7500     565.1
   22.2500     540.1
   22.7500     515.7
   23.2500     525.9
   23.7500     560.3
   24.2500     587.1
   24.7500     585.1
   25.2500     582.0
   25.7500     547.7
   26.2500     551.5
   26.7500     516.8
   27.2500     487.8
   27.7500     474.0
   28.2500     482.5
   28.7500     487.5
   29.2500     492.9
   29.7500     502.9
   30.2500     483.8
   30.7500     475.9
   31.2500     492.4
   31.7500     499.0
   32.2500     489.7
   32.7500     481.3
   33.2500     452.2
   33.7500     558.1
   34.2500     599.1
   34.7500     614.0
   35.0000     612.8