The mission of our department is to bring the time perspective of the Earth scientist/historian to bear on contemporary problems of natural-resource conservation and environmental quality. We pursue this mission by exploring present and past interactions of processes that integrate the four terrestrial spheres: lithosphere, hydrosphere, atmosphere, and biosphere; by reconstructing the physical ...

What's new We start a new field season at Stenkul Fiord Ellesmere Island, Nunavut, Canada, on 29 June 2001. Click on the pictures to the left to view new stable isotope data from fossil forest leaf litter layers and fossil wood. If you have any questions you can email Dr. Hope Jahren. Welcome At this web site you will find detailed information regarding University of Pennsylvania research at the ...