  Numerous tephra layers occur within the late Pleistocene Wilson Creek
Formation, where they are interbedded with lacustrine deposits of Lake Russell,
the ancestor of present-day Mono Lake. Most of the tephra layers are rhyolitic
in composition, and were produced from the Mono Craters. We present detailed
stratigraphy and sedimentology of the tephra layers, sampled at twelve outcrops
near the shoreline of Mono Lake and the Mono Craters, and implement grain size,
componentry, and surface morphology analysis to characterize their physical
properties. Sub-unit correlation is proposed for certain tephra units.
Noticeable features of the tephras, such as the occurrence of low-density
rounded or highly vesicular pumice within certain sub-units, are highlighted.
The abundant obsidian, lithics, and ostracods within many sub-units suggest
that the associated eruption pulses involved water-magma interaction.
  Eruptions from the Mono Craters during the late Pleistocene were consistent
neither in frequency nor volume. The Mono Craters were most active during the
eruption of tephras in Sequences C ($\sim$42.5-39.4 ka) and A ($\sim$14.1-12.9
ka), and Pleistocene volcanic activity reached its peak during the eruption of
tephra layer C11. Detailed interpretation of tephra layer B7 and tephras in
Sequence A is given. Tephras in Sequence B ($\sim$26.2-23.1 ka) may have had
their vents located in the southern half of the Mono Craters, or are smaller in
volume (except for B7), compared to the other tephras in the Wilson Creek
Formation. Vents for tephra layers A4, A3, and A1 are located near the northern
end of the Mono Craters. The stratigraphy of tephra layers B7 and A1 suggests
an unstable depositional environment, which can be used to help constrain the
water-level history of Lake Russell during the late Pleistocene.
