Sources:

Rogers, Alexander
2010   Bodie Hills Obsidian from Mono County, Eastern California: A Hydration Rate and an Issue. International Association of Obsidian Studies Bulletin 43:27-39.

Rogers' proposed obsidian hydration calibration for Bodie Hills obsidian employs the formula t = 103 x 2, in which "t" is the age in radiocarbon years before A.D. 1950 and "x" is the thickness of the hydration rind in microns. In the timeline, radiocarbon ages have been converted to calendar years A.D./B.C., based on informally estimated means of the one-sigma intercept ranges according to Calib 6.0.

The calibrations do not include adjustments for temperature history, which may substantially affect the results. They also do not take into account other possibly significant factors such as humidity or intra-source chemical variability.