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. Meteoric 10 Be ( 10 Be met ) concentrations insoil profiles have great potential as a geochronometer and a tracer of Earthsurface processes, particularly in fine-grained soils lacking quartz thatwould preclude the use of in situ produced 10 Be ( 10 Be in situ ). Oneprerequisite for using this technique for accurately calculating rates anddates is constraining the delivery, or flux, of 10 Be met to a site.However, few studies to date have quantified long-term (i.e., millennial)delivery rates, and none have determined a delivery rate for an erodingsoil. In this study, we compared existing concentrations of 10 Be in situ with new measurements of 10 Be met in eroding soils sampledfrom the same depth profiles to calibrate a long-term 10 Be met delivery rate. We did so on the Pinedale ( ∼  21–25 kyr) and BullLake ( ∼  140 kyr) glacial moraines at Fremont Lake, Wyoming(USA), where age, grain sizes, weathering indices, and soil properties areknown, as are erosion and denudation rates calculated from 10 Be in situ . After ensuring sufficient beryllium retention in each profile,solving for the delivery rate of 10 Be met , and normalizing forpaleomagnetic and solar intensity variations over the Holocene, we calculate 10 Be met fluxes of 1.46 ( ± 0.20)  ×  10 6  atoms cm −2  yr −1 and 1.30 ( ± 0.48)  ×  10 6  atoms cm −2  yr −1 tothe Pinedale and Bull Lake moraines, respectively, and compare these valuesto two widely used 10 Be met delivery rate estimation methods thatsubstantially differ for this site. Accurately estimating the 10 Be met flux using these methods requires a consideration of spatial scale andtemporally varying parameters (i.e., paleomagnetic field intensity, solarmodulation) to ensure the most realistic estimates of 10 Be met -derived erosion rates in future studies.

geochronology

Calibrating a long-term meteoric &amp;lt;sup&amp;gt;10&amp;lt;/sup&amp;gt;Be delivery rate into eroding western US glacial deposits by comparing meteoric and in situ produced &amp;lt;sup&amp;gt;10&amp;lt;/sup&amp;gt;Be depth profiles