July 20, 2009
A 7,000-year Archive of Climate Change, Human Impact and Uncovered Mysteries


Lamont-Doherty Earth Observatory
Adjunct Senior Research Scientist
Adjunct Senior Research Scientist
Lamont Doherty Earth Observatory

Digging deep into tidal marshes one discovers their important role as recorders of major environmental change in the Hudson Valley. Taking sediment cores and analyzing the peat, we count pollen grains, plant macrofossils and charcoal—all of which document the dramatic and abrupt shifts in the Hudson Valley’s regional climate such as the Medieval Warming drought that occurred between 800-1350 AD. Other studies show the impacts of human disturbance since the 1600’s, such as the effects of regional forest clearance and the resulting spread of invasive species.