Age M Volcano-Tephra Stratigraphy 0.023 M3.8 Toya.Usu-1977 0.027 M4.0 Tia Tia-1973 0.038 M3.7 Tokachi-1962 0.056 M3 Toya.ShowaShinzan-1944 0.067 Iwozan-1936 0.071 M4.5 Komagatake-a 4 cm above -c1 0.074 M3.0 Tokachi-1926 0.090 M3 Toya.Usu-1910 0.091 M2.5 Shikotsu.Tarumai-1909 0.102 M2.0 Maruyama-a above Tarumai-a 0.110 Iwozan-1890 0.144 M4.2 Komagatake-c1 3 cm above -d 0.147 M3 Toya.Usu-1853 1 cm above -1822 0.178 M3.7 Toya.Usu-1822 2 cm above -b 0.2 M1.7 Kuttara.Jigokudani 1 cm above Usu-b 0.2 M3 Rausu-unnamed above Tarumai-a 0.231 M3.3 Toya.Usu-1769 0.259 M4 Oshima-1741 0.261 M5.2 Shikotsu.Tarumai-a 0.333 M5.4 Shikotsu.Tarumai-b 0.1 cm above Usu-b 0.337 M5.4 Toya.Usu-b 0.35 Tokachi Lava (unnamed) 0.360 M5.4 Komagatake-d 0.5 cm below Us-b; 0.7 cm below Tarumai-a 0.36 M2 Shikotsu.Eniwa-Poropinai below Tarumai-a 0.97 M5.3 Kutcharo.Mashu-b 3 cm (peat) above Tomakomai 1 Kutcharo-Atosanupuri 1 M2.0 Maruyama-b 1.054 M7.4 Baitoushan-Tomakomai 4 cm below Komagatake-d; 7 cm below Usu-b 1.085 M5.7 Towada-A 1.46 M4.1 Rausu-a 1.6 M2 Komagatake-e 3 cm below Tomakomai 2 Toya.Usu.Zenkoji debris avalanche 13 cm below Usu-b 2 M4.3 Akan.Meakan-unnamed 2 M4 Kutcharo.Mashu-d 2.2 M3.5 Rausu-b 2.3 M3 Tokachi.Ground crater 3 M5.8 Shikotsu.Tarumai-c 17 cm below -b 3 M5 Komagatake-f 20 cm below -e; 7 cm below Tomakomai 6 M4 Komagatake-g 45 cm below -d 7.330 M8.1 Kikai-Akahoya 7.9 M6.4 Kutcharo.Mashu-f/g/h/i/j 9 M5.6 Shikotsu.Tarumai-d 35cm below -c 10 M4 Kutcharo.Mashu-k 15 cm below -j 10 Taisetsu.Mikurazawa lava 13 M5.6 Kutcharo.Mashu-l 30 cm below -k 14 M6.3 Nigorikawa 70cm below Komagatake-f 15 M6.7 Towada-L MIS2.2 17 M5 Komagatake-h1 30 cm below Nigorikawa 17 M5.3 Yotei-1 19 M6.0 Shikotsu.Eniwa-a 30 cm below Tarumai-d; 80 cm above Shikotsu-1 20 M5.6 Rishiri-Wankonosawa 25 Kutcharo-Toyozumi 27 M5.5 Kutcharo-HigashiKayano 110 cm above Yambetsu 28.00 M8.3 Aira-Tanzawa MIS3.1 28 M5.2 Shikotsu.Eniwa-b 30 M6.7 Towada-N MIS3.1 30 M5.3 Yotei-3 above Shikotsu-1 30 M5.8 Kutcharo-Tokotan 1 32 M6 Taisetsu-SoUnkyo stratigraphy with Shikotsu-1 is unknown 32 unknown-Bekkai between Tokotan 1 and 2 34 M5.8 Kutcharo-Tokotan 2 35 Komagatake-h2 36 Kutcharo-Koshimizu 1 38 M5.9 Kutcharo-Tokotan 3 39.99 M6.1 Kutcharo-Yambetsu immediately above Kutcharo-1 40.00 M7 Kutcharo-1 MIS3.2, 5 cm above Shikotsu-1 40 Taisetsu-Obako 1 41 M7.2 Shikotsu-1 MIS3.2 42 M6.2 Kuttara-1 10 cm below Shikotsu-1 42 Kutcharo-Koshimizu 2 48 M4 Toya.Donkoroyama 120 cm below Usu-b; 30 cm above Ohara 50 M5.5 Toya-Osarugawa 32 cm above Kuttara-2; below Shikotsu-1 50 M6 unknown-Rakko 2 40 cm below Rakko 1 50 Kutcharo-Koshimizu 3 50 Taisetu-Obako 2 53 M6.6 Zenigame-Menagawa 100 cm below Shikotsu-1 53.5 M4 Toya.Nakajima-Ohara 5 cm above Kuttara-2; immediately below Menagawa 55 M6.0 Kuttara-2 58 M5 Kuttara-Takeura between Kuttara-2 and -3 58 M5 (Shikotsu-3) 75 cm below Kuttara-1; 30 cm below Menagawa 58.1 M6.2 Kuttara-3 3 cm above Hayakita 58.3 M5 Shikotsu-5 1 cm below -4 58.5 M5 Kuttara-Hayakita 1 cm below Shikotsu-5 60 M5 Shikotsu-6 3 cm below Hayakita 60.1 M6.5 Shikotsu-7/8/9/10 immediately below -6; 100 cm above Kuttara-6 62 M5 Kuttara-4 10 cm below Hayakita 83 M6 Rakko 3 21 cm above -4 83 M5 Kuttara-5 18 cm above -6 85 M5 Rishiri-Kabutouma 2 immediately above Aso-4 86 M6.2 Kuttara-6 5 cm above Aso-4 86.9 M7 Kutcharo-2/3 MIS5.2; 0.7 cm above Aso-4 87.00 M8.4 Aso-4 MIS5.2 88 M6 Kuttara-7 10 cm below -6 89 M5 unknown-Shari 12 cm below Aso-4 95 unknown-Matsumae 95 M6 Kukttara-8 below Aso-4 100 M5 Rishiri-Kabutonuma 1 100 unknown-Atsuma 1 105 M7.4 Toya MIS5.4 110 M5 Rishiri-Acharu 115 M7 Aso-3 117.0 M7.4 Kutcharo-4 MIS5.5 117.1 M6 unknown-Pink 0.5 cm below Kuttara-4 120 unknown-Atsuma 4 immediately above Hayakita formation of MIS5.5 120 unknown-Osarugawa above KamiNagawa formation 140 Kutcharo-5 ignimbrite 160 Akan-upper ignimbrite 190 Akan-middele ignimbrite 220 Akan-lower ignimbrite 250 Kutcharo-6 ignimbrite 280 Kutcharo-7 ignimbrite 310 Kutcharo-8 ignimbrite 340 Kutcharo-Koume ignimbrite 400 unknown-Warabitai 700 unknown--KamiAsahigaoka 850 Shikaribetsu-Kuttari 900 Tokachi ignimbrite 1590 Toya?-Sobetsu ignimbrite