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In this study, we investigate the foundations of the hydrated volcanic glass paleoelevation-paleoenvironment proxy by testing (1) the sensitivity of volcanic glass δD values to laboratory procedures, (2) the reliability of young glass reconstructions of observed meteoric water values, and (3) the paleoenvironmental reconstructions based on volcanic glass in comparison to those of other proxies. Volcanic glass δD values are insensitive to variations in laboratory pretreatments, displaying no significant shift in δD values with variations in duration of drying, rinsing, the temperature at which glass is dried, or with the grain size that is analyzed. However, clay adhering to the...

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