• Y1, Niigata pref.
  • Y1, Wakayama pref.
  • Y-1, Saitama pref.
  • Y1 Member
  • Y2, Niigata pref.
  • Y2, Wakayama pref.
  • Y2 Member
  • Y3
  • Y3 Member
  • Y4
  • Y4 Member
  • Y5 Member
  • Y6 Member
  • Y-94
  • Y-118
  • Y138-141
  • Ya
  • Ya-1
  • Ya-2
  • Ya-3
  • Ya-4
  • Ya-5
  • Ya-6
  • Yabakei Pyroclastic Flow Deposit
  • Yabashira Volcanic Rocks
  • Yabashira volcanoes
  • Yabashirayama volcanic body
  • Yabashirazawa Lavas
  • Yabayashi Gravel Formation
  • Yabe Formation, Kanagawa pref.
  • Yabe Formation, Aichi Formation
  • Yabe Group
  • Yabitsudake Lavas
  • Yabitsuzawa Lavas
  • Yabu Formation
  • Yabuhara Complex
  • Yabuhara Formation
  • Yabuta Formation
  • Yabuta Siltstone Member
  • Yabuzuka Formation
  • Yabuzuka Terrace Deposit
  • Yachidaira Lake Deposit
  • Yachi Formation
  • Yachiho Formation
  • Yachiho-kogen Lavas
  • Yachiho Mudflow Deposit
  • Yadagawa Formation
  • Yadagawa Group
  • Yada Sandstone Member
  • Yada Terrace Gravels
  • Yadawara Conglomerate Member
  • Yadorigizawa Formation
  • Yae Formation
  • Yaemonzawa Lava
  • Yaeyama Basalt I
  • Yaeyama Basalt II
  • Yaeyama Coal-bearing Beds
  • Yaeyama Group
  • Yaeyama Lava I
  • Yaeyama Lava II
  • Yaeyama Lava III
  • Yagami Formation
  • Yagane Formation
  • Yagen Formation
  • Yagigahana Formation
  • Yagigahana Lava Member
  • Yagii Formation
  • Yagisawa mudstone
  • Yagisawa Mudstone Member
  • Yagisawatoge Formation
  • Yagisawa Tuff Member
  • Yagi Tephra
  • Yagiyama Formation, Osaki city
  • Yagiyama Formation, Sendai city
  • Yago Formation
  • Yagori Volcaniclastics
  • Yagoto Formation
  • Yaguki Granodiorite
  • Yaguki Limestone
  • Yaguki Metamorphic Rocks
  • Yaguradake Quartz Diorite
  • Yagyu Granite
  • Yahagi Formation
  • Yahazudaira Lava
  • Yahazudake Mudstone and Sandstone Member
  • Yahazugasen Lava
  • Yaita Tephra
  • Yajiro Complex
  • Yajishita Rhyolites
  • Yakebe Pumice
  • Yakedake Dome Lava
  • Yakedake volcano
  • Yakedake volcano group
  • Yakeishidake volcano
  • Yakeiwadani Granodiorite
  • Yakeo I Tephra
  • Yakeo II Tephra
  • Yakeyama volcanic group
  • Yakeyama volcano, Akita pref.
  • Yakirizawa Lava
  • Yakiyama Lava
  • Yakumo volcanic rock
  • Yakuno Central Subzone
  • Yakuno central zone
  • Yakuno Complex
  • Yakuno Group
  • Yakuno Intrusive Rocks
  • Yakuno northern zone
  • Yakuno North Subzone
  • Yakuno Ophiolite
  • Yakuno Rocks
  • Yakuno southern zone
  • Yakuno South Subzone
  • Yakuoji Formation
  • Yakuoji Mudstone and Sandstone Member
  • Yakuoji Siltstone and Sandstone Member
  • Yakura Formation
  • Yakushidake cauldron
  • Yakushidake Lava
  • Yakushidake Rhyolites
  • Yakushidakeshita Lava
  • Yakushidake Volcanic Rocks
  • Yakushi Formation
  • Yakushigawa Formation
  • Yakushima Granite
  • Yakushimidaira Dacite
  • Yakushisan Andesites
  • Yakushiyama Basalts
  • Yakushizawamigimata Conglomerate Member
  • Yamabe Group
  • Yamada Formation, Hyogo pref.
  • Yamada Formation, Miyagi pref.
  • Yamada Formation, Tokyo
  • Yamadagaya Formation
  • Yamada Granodiorite
  • Yamadanaka Tuff
  • Yamadano Formation
  • Yamada Sandstone and Conglomerate Facies
  • Yamada Sandstone and Conglomerate Member
  • Yamada Tephra
  • Yamada type, Miyako Granite
  • Yamadori Formation
  • Yamaga Complex
  • Yamagami Formation, Fukushima pref.
  • Yamagami Formation, Gifu pref.
  • Yamagami Metamorphic Rocks
  • Yamagasu Group
  • Yamagata Muddy Sandstone Member
  • Yamaguchi caldera
  • Yamaguchi cauldron
  • Yamaguchi Formation
  • Yamaguchi Gravel Bed
  • Yamaguchi Pumice Tuff
  • Yamaguchi Tuff
  • Yamaho Mudstone and Tuff Member
  • Yamairagawa Formation
  • Yamairi Formation
  • Yamajari Formation
  • Yamakuwayama Lava
  • Yamamawari Formation
  • Yamami Formation
  • Yamami Siltstone Member
  • Yamamio explosion crater
  • Yamamiya Pumice Fall Deposit
  • Yamamoto Formation, Niigata pref.
  • Yamamoto Formation, Tochigi pref.
  • Yamamotoyama Loam
  • Yamanaka Formation
  • Yamanaka Gravels Member
  • Yamanaka Granite
  • Yamanaka Granodiorite
  • Yamanashi Gravel Bed
  • Yamanishi Formation
  • Yamanoi Formation
  • Yamanoisshiki Member
  • Yamanokami Gabbros
  • Yamanokuchigawa Welded Tuff
  • Yamanouchi Formation, Nakagawa Group
  • Yamanouchi Formation, Mizunami Group
  • Yamanouchi Member
  • Yamasa Granite
  • Yamasaki Formation, Hyogo pref.
  • Yamasaki Formation, Nara pref., Pleistocene
  • Yamasaki Formation, Nara pref., Cretaceous
  • Yamase-domari Lavas
  • Yamashiro Granite
  • Yamashita Alternation Member
  • Yamashita Formation, Miyagi pref.
  • Yamashita Formation, Osaka pref.
  • Yamasuge Limestone Member
  • Yama Tephra
  • Yamatogawa Sandstone Member
  • Yamato Group
  • Yamato Pyroclastic Flow Deposit
  • Yamatsuda Formation
  • Yamauchi Formation
  • Yamauchi Member
  • Yamaya Formation, Akita pref.
  • Yamaya Formation, Iwate pref.
  • Yamaya Formation, Yamagata pref.
  • Yamaya Formation, Niigata pref.
  • Yamaya Granite
  • Yamayakawa Formation
  • Yamayatoge Body
  • Yamazaki Calcareous Sandstone Member
  • Yamazaki Conglomerate Member
  • Yamazaki Debris Avalanche Deposit
  • Yamazaki Formation
  • Yamazaki Gravel Bed
  • Yamazumori Lava
  • Yambarazaka Alternation Member
  • Yamizo Group
  • Yamuke Formation
  • Yanabe Terrace Deposits
  • Yanagida Formation
  • Yanagi Formation
  • Yanagisawa Formation, Iwate pref.
  • Yanagisawa Formation, Niigata pref.
  • Yanagisawa Formation, Nagano pref.
  • Yanagisawa Mudflow Deposit
  • Yanagisawa Pumice Deposit, Iwate pref.
  • Yanagisawa Tuff, Miyagi pref.
  • Yanaizu Pyroclastic Flow Deposit
  • Yanajimayama Mass
  • Yanashi Formation
  • Yanba Formation
  • Yaoromappugawa Formation
  • Yaoroshi Tuff
  • Yaotsu Granite
  • Yarigatake Crystalline Schist
  • Yarigatake Metamorphic Rocks
  • Yarimi Tuff Member
  • Yarimizu Tephra
  • Yarisawa Breccia
  • Yasemori Lava
  • Yashigamine Volcanics
  • Yashiki Conglomerate Member
  • Yashiki Formation
  • Yashiki Mudstone
  • Yashimayama Andesite
  • Yashio Formation
  • Yashiozawakawa Formation
  • Yashiro Conglomerate and Tuff Member
  • Yashiroda Formation
  • Yashiro Formation
  • Yashirogawa Debris Avalanche Deposits
  • Yashiro Tuff and Conglomerate Member
  • Yasuda Formation
  • Yasudate Loam
  • Yasudate Terrace Deposit
  • Yasugawa Group
  • Yasugi Formation
  • Yasu Granite
  • Yasukajigamori Lava Dome
  • Yasukawa Formation
  • Yasumori Lava
  • Yatagawa Granites
  • Yatamaru Body
  • Yatani Formation
  • Yataro Formation
  • Yatazodani Group
  • Yatazodani Quartz Diorite
  • Yateikurasawa Lavas
  • Yatoko Lava
  • Yatoko Member
  • Yatomi Formation
  • Yatsu Clay Member
  • Yatsugamaruyama Formation
  • Yatsugatake Mudflow Deposit
  • Yatsugatake volcanoes
  • Yatsuka Formation
  • Yatsuo Granite
  • Yatsuo Group
  • Yatsuoyama Pyroclastics
  • Yatsushiro Formation
  • Yatsushiro Granite
  • Yatsushiro Metamorphic Rocks
  • Yatsuyama Formation
  • Yawata Tephra
  • Yazaki Tephra
  • Yazu Formation
  • Yb0
  • Yb1
  • Yb2
  • Yb3
  • Yb4
  • Yb5
  • YbP
  • Year 1739 Pyroclastic Flow Deposit
  • Year 1919 Ojigokudani eruption deposit
  • Yellow
  • Yezo Group
  • Yezo Supergroup
  • Yih
  • Yk
  • YK
  • YK03
  • Yk1
  • Yk2
  • Yk3
  • Yk5
  • Yk9a
  • Yk12
  • Ykp
  • Ylg
  • YM
  • YmP
  • Yn-1
  • Yobito Formation
  • Yodate Lava
  • Yodoe Pumice
  • Yogo Formation
  • Yogosawa Conglomerate Member
  • Yoka Formation
  • Yokaichiba Formation
  • Yokaichi Formation
  • Yokaichi Gravels Member
  • Yokatsu Formation
  • Yokawa Formation
  • Yokawa Granodiorite Porphyrite
  • Yokawa Tuff
  • Yokigaoka I Tephra
  • Yokigaoka II Tephra
  • Yokigaoka Clays Member
  • Yokinzan Mélange
  • Yokkaichiko Formation
  • Yokoashiyama Lavas
  • Yokobatake Alternation of Sandstone and Mudstone Member
  • Yoko-dake Alternation of Shale and Sandstone
  • Yokodake Basal Lava
  • Yokodake Lava, Nagano pref.
  • Yokodake Lavas, Aomori pref.
  • Yokodake Volcanic Rocks
  • Yokojuku Formation
  • Yokokabe Formation
  • Yokokawa Formation, Nagano pref., Mino Belt
  • Yokokawa Formation, Nagano pref., Ryoke Belt
  • Yokokawa Formation, Niigata pref.
  • Yokokawagawa Metamorphic Rocks
  • Yokokura Formation
  • Yokokurayama Group
  • Yokomagaura volcano
  • Yokomuki caldera
  • Yokomuki Formation
  • Yokonagane Lava
  • Yokone Formation
  • Yokonetoge Formation
  • Yokonuma Formation
  • Yokoo Formation, Nagano pref.
  • Yokoo Formation, Toyama pref.
  • Yokooyama Trachyte
  • Yokosawa Formation
  • Yokosawa Sandstone and Mudstone Member
  • Yokosuka Formation
  • Yokosuka-L Tephra
  • Yokosuka Tephra
  • Yokosuka-U Tephra
  • Yokota Formation
  • Yokota Granite
  • Yokota Granodiorite
  • Yokota intrusion
  • Yokota Volcano Group
  • Yokoteyama Lava
  • Yokoyakyo Lavas
  • Yokoyama Dacite
  • Yokoyama Formation
  • Yokoyama Volcanic Rocks
  • Yokoyugawa Lake Deposit
  • Yokozawa Dacite
  • Yokozumi Formation
  • Yomiurishindo Andesite
  • Yomurakawamuro Formation
  • Yonabaru Formation
  • Yonago Andesite
  • Yonagokimyo Lavas
  • Yonago Lavas
  • Yonago Tuff Breccia
  • Yonagu Formation
  • Yonagu Unit
  • Yonamine Formation
  • Yonegamori Dacite
  • Yonegamori Dacite Member
  • Yonesato Formation
  • Yoneyama Formation
  • Yoneyama Tuff
  • Yonezawa Lava
  • Yono I Tephra
  • Yono II Tephra
  • Yono III Tephra
  • Yono Member
  • Yontan Limestone
  • YoP-2
  • Yoridaizawa Lava
  • Yorihata Member
  • Yorii Acidic Rocks
  • Yorii Conglomerate Formation
  • Yorii Formation
  • Yorii. Plutonometamorphic Complex
  • Yorii Quartz Porphyry
  • Yorii Terrace Deposit
  • Yorii Welded Tuff
  • Yoro Formation
  • Yoro Group
  • Yoroibata Formation
  • Yoroiiwa Lava and Dike
  • Yoroiiwa Pyroclastic Flow Deposit
  • Yoro Sand Member
  • Yoro Tephra
  • Yoro-U Tephra
  • Yosa Group
  • Yosa Terrace Deposits
  • Yosawa Formation
  • Yoshida Alternation Member
  • Yoshida Andesite
  • Yoshida Formation
  • Yoshidagawa Andesites
  • Yoshida Granodiorite
  • Yoshida Plutonic Complex
  • Yoshida Shell Bed, Arakawa Group
  • Yoshida Shell Bed, Kagoshima pref.
  • Yoshifu Terrace Deposits
  • Yoshigadaira Tuff
  • Yoshigasawa Formation
  • Yoshihama Formation
  • Yoshihama type
  • Yoshihara stage
  • Yoshii Formation
  • Yoshiigawa Formation
  • Yoshiki Formation
  • Yoshikura Mudstone Member
  • Yoshimagawa Composite Mass
  • Yoshimagawa mass
  • Yoshimi Metamorphic Rocks
  • Yoshimo Formation
  • Yoshinaga Alternation Member
  • Yoshinazawa Formation
  • Yoshinodaira Mudflow Deposit
  • Yoshino Formation
  • Yoshino Granodiorite
  • Yoshino Pumice Flow Deposit
  • Yoshino Pyroclastic Flow Deposit
  • Yoshinoya Formation
  • Yoshinoyama Group
  • Yoshinoyama zone
  • Yoshinoya Member
  • Yoshitsuki Formation
  • Yoshiwa Group
  • Yoshiwara Formation
  • Yoshiwara Lava
  • Yoshizu Formation
  • Yot
  • Yotei volcano
  • Yotsudake Central Cone
  • Yotsudake Lava
  • Yotsudake volcano
  • Yotsugoya Formation
  • Yotsukura Formation
  • Yotsuyaku Formation
  • Yotsuzawa Formation
  • Yotsuzawa Tuff
  • Younger Atosanupuri Volcano
  • Younger Central Cones, Hakone volcano
  • Younger Debris Avalanche Deposits, Tateyama volcano
  • Younger Debris Flow Deposit
  • Younger Dorokoro Member
  • Younger Dune I
  • Younger Dune II
  • Younger edifice, Oshima volcano
  • Younger Fan Deposits, Akita pref.
  • Younger Fan Deposit, Nagano pref.
  • Younger Fan Deposits, Aichi pref.
  • Younger Haruna Volcanic Fan Deposit
  • Younger Haruna volcano
  • Younger Higher Terrace Deposits, Tsu
  • Younger Humic Soil
  • Younger Inbi stage intrusive rocks
  • Younger Ino Metamorphic Complex
  • Younger Josho Lake Deposit
  • Younger Kitadake Volcano
  • Younger Loam
  • Younger Lower Terrace Deposits, Tsu
  • Younger Middle Terrace Deposits, Tsu
  • Younger Minamidake Volcano
  • Younger Obasute Mudflow Deposit
  • Younger Okemi Landslide Deposits
  • Younger Ontake Tephra Group, Lower
  • Younger Ontake Tephra Group, Upper
  • Younger Ontake Volcanic Rocks
  • Younger Oshima Group
  • Younger parasitic cone and crater, Miyakejima volcano
  • Younger period, Yatsugatake volcano
  • Younger Ring dyke
  • Younger Ryoke Granitoids
  • Younger Sand Dune, Katamachi Dand Dune
  • Younger Sand Dune I, Arahama Sand Dune
  • Younger Sand Dune II, Arahama Sand Dune
  • Younger Sand Dune Deposits
  • Younger sand gravel bed, Kanazawa
  • Younger Shigayama Volcanic Rocks
  • Younger Shinodayama Gravel Bed
  • Younger stage, Shirouma-Oike volcano
  • Younger stage 1, Tokachidake volcano
  • Younger stage 2, Tokachidake volcano
  • Younger stage Hokusatsu Volcanic Rocks
  • Younger stage Nansatsu Volcanic Rocks
  • Younger Stratovolcano (Akagi Volcano)
  • Younger Talus Deposits, Tsuge
  • Younger Terrace Deposits, Nagaragawa river
  • Younger Terrace Deposit, Taira
  • Younger volcanic-cone-building stage (Akagi Volcano)
  • Younger Volcanic Fan Deposit, Nekoma volcano
  • Younger volcano, Daisen volcano
  • Younger Yakedake volcanoes
  • Young Iwate volcano
  • Youra Formation
  • Youra Unit
  • YP
  • YPD
  • Y-Pm
  • YPT
  • YR2-Kd21
  • Ys
  • Ys1
  • Ys2
  • Ys3
  • Ys4
  • Ysg5
  • YsS
  • Yt
  • YT
  • YT3
  • Yt-Kw
  • Yt-Pm4 Tephra
  • Yu
  • YU
  • Yuantani Formation
  • Yuasa Formation
  • Yuba Formation
  • Yubari Formation
  • Yubetsu Formation
  • Yubunegawa Black Shale Member
  • Yubune Tephra
  • Yuchi Formation
  • Yudamatagawa Lava
  • Yudani Conglomerate Member
  • Yudonosan volcano
  • Yudonosawa Andesite
  • Yufune Formation
  • Yugamine Dacite
  • Yugashima Group
  • Yugashima Propylites
  • Yugawara volcano
  • Yugoya Formation
  • Fuguchi Formation
  • Yuguchiyama Formation
  • Yuguruma Formation
  • Yuhizawa Formation
  • Yukagi Unit
  • Yukawa-dani Volcanic Rocks
  • Yukawa Formation, Nagano pref.
  • Yukawa Formation, Wakayama pref.
  • Yukawa Pyroclastic Flow Deposit
  • Yukawa Welded Tuff
  • Yukinari Sand
  • Yukizawa Formation
  • Yumachi Formation
  • Yumigahama Formation
  • Yumigahama Sandbar
  • Yumiike Lava
  • Yumi-ike maar
  • Yumiorezawa Formation
  • Yumoriyama-Kanayama Welded Tuff
  • Yumoriyama Volcanic Products
  • Yumoriyama Welded Tuff
  • Yumoto Calcareous Sinter
  • Yumoto Formation, Iwate pref.
  • Yumoto Formation, Miyagi pref.
  • Yumoto Travertine
  • Yunagaya Group
  • Yunohama Granite
  • Yunokami Formation
  • Yunokawa Formation
  • Yunokawa Green Tuff Member
  • Yunokogawa Formation
  • Yunokogawa Sandstone and Mudstone Member
  • Yunokoshiyama Ryolite
  • Yunomaru Lava
  • Yunomaru lava dome
  • Yunomatagawa Dacitic Tuff Member
  • Yunomatagawa Formation
  • Yunoo Complex
  • Yunoo Formation
  • Yunosawa caldera
  • Yunosawa Formation
  • Yunosawagawa Formation
  • Yunosawa pyroclastic deposit
  • Yunosawa Rhyolites
  • Yunosawa Sandstone Member
  • Yunose Welded Tuff Member
  • Yunotake Rhyolite
  • Yunotani Eclogite Unit
  • Yunotani Lava
  • Yunoyama Gravel Facies
  • Yura Formation
  • Yuragawa Complex
  • Yurakucho Formation
  • Yura Unit
  • Yuridaira Formation
  • Yurihara Debris Avalanche Deposits
  • Yurihara Debris Deposits
  • Yusan Formation
  • Yushima Formation
  • Yushio Group
  • Yushin Body
  • Yusubaru Granite
  • Yusugawa Unit
  • YUT5
  • Yutorinuma Formation
  • Yuwandake Andesite
  • Yuya Mudstone Member
  • Yuyawan Group
  • Yuzawa Formation
  • Yuzawa Lava I
  • Yuzawa Lava II
  • Yuzawa Lava III
  • Yuzawa Lava IV
  • Yuzawa Lava V
  • Yuzawa Lava Dome
  • Yuzawa Sandstone Conglomerate Member
  • Yuzurio Pyroclastics
  • Yuzuritoge Formation
  • Ywg
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