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Similar trends are apparent from zircon and apatite fission-track data, which increase eastward from 19 to 29 Ma, and 13 to 16 Ma, respectively.
In a study to test the feasibility of dating samples from the tuff, the samples were contaminated with non-juvenile components which could not be separated out, giving ages over million years.
The original erroneous date by Fitch and Miller could be an accurate date of a roughly 2.
Curtis and R.
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Cox and A.
Apparently, some pumice from that volcanic event had been incorporated into the KBS Tuff.
They attributed the spread to reheating of the crystals after deposition.
The weight of evidence soon began to converge on an age near 1.