correlation of certain stratigraphic levels in various deposiDetailed tephrochronological studies in Kamchatka Peninsula, tional successions. Their ages being determined, they beRussia, permitted documentation of 24 Holocene key-marker come excellent time markers and can be used in geochronotephra layers related to the largest explosive eruptions from 11 logical investigations. Tephra (volcanic ash) horizons are volcanic centers. Each layer was traced for tens to hundreds of among the best marker beds of this kind. C yr B.P.) SH 2 (É1000 yr B.P.) and SH 3 (É1400 yr B.P.) from is a few tens of centimeters thick in areas distant from the Shiveluch volcano; KZ (É7500 yr B.P.) from Kizimen volcano; active volcanoes and increases up to several meters at their KRM (É7900 yr B.P.) from Karymsky caldera; KHG (É7000 yr foot. This cover provides a continuous record of the explo-B.P.) from Khangar volcano; AV 1 (É3500 yr B.P.), AV 2 (É4000 sive eruptions during the Holocene, while earlier ash layers yr B.P.), AV 4 (É5500 yr B.P.), and AV 5 (É5600 yr B.P.) from in Kamchatka were almost everywhere destroyed during Avachinsky volcano; OP (É1500 yr B.P.) from the Baraniy Amfi-Late Pleistocene glaciation and occur as isolated beds. stratigraphic value and 9 important local marker ash layers.from Shtyubel cone in Ksudach volcanic massif; and KO (É7700 yr B.P.) from the Kuril Lake-Iliinsky caldera. Tephra layers SH 5 Identification of tephra sources was possible due to prelimi-(É2600 yr B.P.) from Shiveluch volcano, AV 3 (É4500 yr B.P.) nary studies that included detailed mapping of the Holocene from Avachinsky volcano, OP tr (É4600 yr B.P.) from Opala vol-eruptive centers (Melekestsev et al., 1974) and investigations cano, KS 3 (É6100 yr B.P.) and KS 4 (É8800 yr B.P.) from Ksudach of geochemical types and petrology of Late Cenozoic volcacalderas, KSht 1 (É1100 yr B.P.) from Shtyubel cone, and ZLT nic rocks (Volynets, 1994). These data allowed us to identify

The ages of most of calderas,

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