36Cl and 10Be cosmogenic exposure age data for the Black Rock basaltic lava flow, Lunar Crater volcanic field, Nevada, imply an emplacement age of ∼38 ± 10 ka. 36Cl data for the 600 ka flow north of the Lunar Crater maar are consistent with (1) an apparent erosion rate of ∼3 m/m.y., (2) a model of desert pavement formation in which basalt clasts eroded from the flow remain on the surface of the eolian-derived sediments that mantle the flow, and (3) the early formation of the eolian-derived sediment mantle.

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