This is probably a low estimate, since density could be higher at Crawford Point than at NASA-U. Figures Figure 1. Vertical lines mark annual layers. Comparison of annual layer thicknesses from NASA-U core 1 using calcium versus hydrogen peroxide. Annual layer thicknesses based on analysis of all parameters for NASA-U and all parameters except dust for Humboldt. Hydrogen peroxide data for Crawford Point, showing 13 annual cycles.
Vertical lines mark annual layers.
References D. A. Meese, A. J. Gow, P. Grootes, P. A. Mayewski, M. Ram, M. Stuiver, K. C. Taylor, E. D. Waddington, and G. A. Zeilinski. The accumulation record from the GISP2 core as an indicator of climate change throughout the holocene. H. B. Clausen, N. S. Gundestrup, S. J. Johnsen, R. Bindschadler, and J. Zwally. A Search for a New Deep-Drlling Site.