15 to 17 cm thick; pumice with lesser amounts of blocky grains and platy shards. In fluvial sand overlying Upper White Channel Gravel; ?5.5 m above Little Blanche Ck. tephra (UT1623). Field name 599b
A catalogue of late Cenozoic tephra beds in the Klondike Goldfields and adjacent areas, Yukon Territory
Glass-fission-track ages of late Cenozoic distal tephra beds in the Klondike district, Yukon Territory
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