M.J. Kohn and C.J. Northrup (Geology, Vol. 37, No. 1, p. 47–50)

At the prompting of M. Stipp, we realized that one of the strain calculations in Kohn and Northrup (2009) could not be reconciled with our reported grain sizes. Whereas a grain size of 7 μm for sample CC8-3-2 does yield a differential stress of ∼140 MPa, the calculated strain rate should be ∼1 × 10−10 s−1. Dr. Stipp also correctly questioned our assumed water fugacity. Whereas the value of 400 MPa was chosen to be illustrative, realistic values would be approximately 40...

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