Stalagmite ML-1 is 25 cm long and spans the last deglaciation (18-11 kya). It is from McLean's Cave, a cave in the western Sierra Nevada that is now flooded due to the New Melones Dam. Studying this sample has elucidated the timing a structure of California climate response to Northern Hemisphere glacial cycles.
As stalagmites are Boron and Lithium limited, we hypothesize that neutrons are deflected in the sample due to hydrogen. Therefore regions of maximum neutron deflection (bright orange) are interpreted to be water rich regions (either as vapor or liquid water).
