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Insolation calculation is generated from the orbital parameters
Vostok ice core data:
Petit, J.R., et al., 2001,
Vostok Ice Core Data for 420,000 Years, IGBP PAGES/World Data Center
for Paleoclimatology Data Contribution Series #2001-076.
NOAA/NGDC Paleoclimatology Program, Boulder CO, USA.
ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/vostok/deutnat.txt
Temperature reconstruction is offered within the dataset.
Benthic foram data:
Lisiecki, L. E., and M. E. Raymo (2005), A Pliocene-
"A large portion change in d18Oc records is thought to result of the sequestration of isotopically light oxygen (16O) in large continental ice sheets, resulting in ocean water that has a larger proportion of 18O."
Thus reduction of oxygen 18 (which is upward on the graph) indicates warmer conditions and higher sealevel.
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graph of the elements showing the past and future trends of the Milankovitch cycles