Carbon isotope data from modern and fossil tree rings

Bulk carbon isotope measurements made at high-resolution across modern and fossil tree rings are reported. Fossil data are reported as the average of 3 replicate measurements. More details on the methods and samples can be found in these publications. Modern data were published in: Schubert, B. A., and Jahren, A. H., 2011, Quantifying seasonal precipitation using high-resolution carbon isotope analyses in evergreen wood: Geochimica et Cosmochimica Acta, v. 75, no. 22, p. 7291-7303; doi:7210.1016/j.gca.2011.7208.7002. Fossil data were published in: Schubert, B. A., Jahren, A. H., Eberle, J. J., Sternberg, L. S. L., and Eberth, D. A., 2012, A summertime rainy season in the Arctic forests of the Eocene: Geology, v. 40, no. 6, p. 523-526.