• A-1, Tanohata Granite
• A I, Tappi Volcanic Rocks
• A-2, Tanohata Granite
• A II, Tappi Volcanic Rocks
• A-3, Tanohata Granite
• A III, Tappi Volcanic Rocks
• A-4, Tanohata Granite
• A IV, Tappi Volcanic Rocks
• A-5, Sr-poor, Tanohata Granite
• A-5, Sr-rich, Tanohata Granite
• A-6, Tanohata Granite
• A-7, Tanohata Granite

• A Alternation of Sandstone and Mudstone Member

• Ab I
• Ab II
• Abashiri Formation
• Abetsu Formation
• Abire Granodiorite
• Abire intrusion
• Abodani Lava
• Abotoge Lava
• Abugawa Sandstone-Mudstone Member
• Abu Group
• Abukasanbe Mélange
• Abuki Formation
• Abukuma Belt
• Abukuma Granitic Rocks
• Aburato Formation
• Aburatsubo Pyroclastic Rock Member
• Abuzuru Formation

• Acchiyama volcano

• Adachigahara Tephra
• Adachi-Medeshima Pumice Bed
• Adachi-Medeshima Tephra
• Adatarasancho Lava Dome
• Adatara volcano
• Adatarayama Lava
• Ad-D
• Ad-DK
• Ad-MH1
• Ad-MH2
• Ad-MH3
• Adoyama Formation

• AFA

• AG
• Agatsuma Clay
• Agatsuma Formation
• Age Group
• Agekura Formation
• Ageshima Formation
• Agi Formation
• Ag-KLP
• Ag-KP
• Ag-MzP1
• Ag-MzP2
• Ag-MzP3
• Ag-MzP4
• Ag-MzP5
• Ag-MzP6
• Ag-MzP7
• Ag-MzP8
• Ag-MzP9
• Ag-MzP10
• Ag-NM1
• Ag-NM2
• Ag-OK
• Ag-OrP
• Ag-UP

• Aharada Andesite

• Aida Formation
• Ai-domari Lavas
• Aihama Formation
• Aihara Formation
• Aikawa Andesite and Pyroclastic Rock Member
• Aikawa Andesite Member
• Aikawa and Kotokawa Terrace Deposit
• Aikawa Group
• Aikawa Subgroup
• Aikawa Volcanic Rock Member
• Aikigawa Mudflow Deposit
• Aikodake Granite
• Aimagawa Formation
• Aimata Formation
• Aimatagawa Body
• Aimata Intrusive Rocks
• Ainaizawa Formation
• Ainohara Andesite
• Ainokaze Formation
• Ainomine pyroclastic cone
• Ainosawa Formation
• Ainoyama Formation
• Aioi Group
• Aioi Terrace Deposit
• Aira Formation
• Aira-Tn Tephra
• Aizawa Formation
• Aishiro Formation
• A-Ito
• Aiyoshi Member
• Aizawa Formation
• Aizen Basalt
• Aizu-kaneyama Volcanic Rocks

• Ajarayama Andesite
• Ajarayama Andesite Member
• Ajigasawa Formation, Lower part
• Ajigasawa Formation, Upper part
• Ajigaura Pumiceous Tuff Member
• Ajima Formation
• Ajiri Formation
• Ajiro Basalt
• Ajiro Formation
• Ajiro volcano

• AK
• Ak1, Akan volcano
• AK-1, Akita-Komagatake volcano
• Ak2
• Ak3
• Ak3pfa
• Ak3pfl
• Ak4
• Ak5
• Ak6
• Ak6-a
• Ak6-apfa
• Ak6-apfl
• Ak6-b
• Ak6-c
• Ak6-d
• Ak7
• Ak7-a
• Ak7-b
• Ak7-c
• Ak7-cpfa
• Ak7-cpfl
• Ak7-d
• Ak7-e
• Ak8
• Ak9
• Ak9-a
• Ak9-b
• Ak9-c
• Ak10
• Ak11
• Ak12
• Ak12-a
• Ak12-b
• Ak12-c
• Ak13
• Ak13-a
• Ak13-b
• Ak14
• Ak14-a
• Ak14-b
• Ak14-c
• Ak14-d
• Ak14-e
• Ak14-f
• Ak14-g
• Ak15
• Ak15-a
• Ak15-b
• Ak15-c
• Ak15-d
• Ak15-e
• Ak15-f
• Ak16
• Ak17
• Akabane Formation
• Akabane Terrace Deposits
• Akabira Formation
• Akada Formation, Nagano pref.
• Akada Formation, Kumamoto pref.
• Akadake Lava
• Akada Lava
• Akadaredani Lavas
• Akagami Formation
• Akagami Shale Formation
• Akagawa Lavas
• Akagidaira Lava
• Akagidairashita Lava
• Akagine Rhyolite
• Akagi Volcano
• Akahage Lava
• Akahageyama Formation
• Akahani volcano
• Akahira Group
• Akai Pyroclastic Flow Deposit
• Akaishidake Formation
• Akaishi Formaiton
• Akaishigawa Diorite Porphyrite
• Akaishi Group
• Akaishi Lava
• Akaiwa Formation, Otaru
• Akaiwa Formation, Tetori Group
• Akaiwa Subgroup
• Akakura Caldera Fill Deposit
• Akakuradake 1st-stage Lava
• Akakuradake 2nd-stage Lava
• Akakuradake 3rd-stage Lava
• Akakuradake 3rd-stage Pyroclastic Rocks
• Akakuradake 4th-stage Lavas
• Akakuradake Lava
• Akakuradake Pyroclastic Rocks
• Akakura Pyroclastic Flow Deposit
• Akakura Tuff
• Akakura Tuff Member
• Akakurazawa Mudflow Deposit
• Akakurazawa Pyroclastic Flow Deposit
• Akakuzuregawa Lava
• Akakuzureyama Andesite
• Akakuzureyama Lava
• Akakuzurezawamigimata Lava
• Akamori Formation
• Akamori Tuff Breccia Member
• Akana Granodiorite
• Akandana Dome Lava
• Akandana volcano
• Akandana Pyroclastic Rocks
• Akan Pyroclastic Fall Deposit
• Akanuma Formation
• Akan volcano
• Akan Welded Tuff
• Akappage volcano
• Akarutoge Pyroclastic Flow Deposit
• Akasaka Formation
• Akasaka Limestone
• Akasaki Formation
• Akasawa Mud Member
• Akashiba Formation
• Akashima Formation
• Akashima Lavas
• Akashio Formation
• Akashio Loam
• Akataki Complex
• Akataki Formation
• Akataki Lava, Fukushima pref.
• Akataki Lavas, Nagano pref.
• Akatani Formation
• Akaya Shale Formation
• Akazakinomine volcano
• Akazawa Formation
• Akazawa Lava
• Akebono Conglomerate
• Akebono Formation
• Akebono Group
• Akedo Terrace Deposits
• Aketo Formation
• Aketo Sandstone
• Akeyo Formation
• Akezawa Formation
• AK-g
• AK-h
• Akibasaki Porphyritic Granite
• Aki Group
• Akikawa Formation
• Akikawa Lapilli
• Akima Formation
• Akimotoko Pyroclastic Flow Deposit
• Akiruppara Formation
• Akita Coastal Dune
• Akita-Komagadake volcano
• Akita-Oshiromori Volcanic Products
• Akiu Group
• Akiyamago Formation
• Akiyoshi Belt
• Akiyoshi Limestone
• Akiyoshi Limestone Group
• Akiyoshi terrane
• Ak-K
• Akka Belt
• Akka Formation
• Akkagawa Formation
• Akka Limestone
• Akka - Tanohata Sub-belt
• Akka Unit
• Akka Volcanic Ash
• Akusa Formation

• ALP
• Alternation facies

• Am1
• Am4
• Am19
• Am28
• Am40
• Am56
• Am61
• Am78
• Am94
• Am98
• Amabiki Body
• Amadanai Formation
• Amaderahara Formation
• Amaderahara Golf Course Formation
• Ama Formation
• Amagase Formation, Tokyo
• Amagase Formation, Nara pref.
• Amagikogaseki Lava
• Amagiri Sandstone and Mudstone Member
• Amagi volcano
• Amago Intrusive Rocks
• Amaike Pumice
• Amaike-toho Lava
• Amaikeyama Lava
• Amakazariyama Volcanics
• Amami Quartz-diorite
• Amamizukoshi Tuff
• Amamizuyama Formation
• Amanokawara Formation
• Amatsu Formation
• Amatsu Mudstone Formation
• Amazakai Pyroclastic Flow Deposit
• Amegochigawa Formation
• Amehatagawa Formation
• Amehatagawa Group
• Amehata Granite
• A Member, Gumizaki Formation
• a Member, U-II Formation, Himenoura Group
• a Member, U-III Formation, Himenoura Group
• a Member, U-IV Formation, Himenoura Group
• Amg slump
• Amidadake Lava
• Amidagawa Pyroclastic Flow Deposit
• Amidase Pyroclastic Flow Deposit
• Amigasayama Lava
• Amino Formation
• Amura Formation

• An1, Anesaki Formation
• An1, Anno Formation
• An2, Anesaki Formation
• An2, Anno Formation
• An20
• An21
• An49
• An73
• An107
• An108
• An116
• An117
• An156
• An157
• An158
• Anami Formation
• Anamizuzawa Basalt Member
• Anamizuzawa Lithic Tuff Member
• Anausi Conglomerate Member
• Anausi Sands
• Anazawa Formation
• Anbo Sandstone Member
• Ancient Sand Dune, Tottori Sand Dunes
• Anden Formation
• Anden Sand Member
• Andesite-basalt Lava and Pyroclastic Rocks Member, Niitsuki Formation
• Andesitic Pyroclastic Rock Member, Niitsuki Formation
• Anegahama Sandstone Member
• Anegasaki Formation
• Anesaki Formation
• Aniai Coal-bearing Member
• Aniai Formation
• Aniai Group
• Anigawa Formation
• Animatsukurasawa Lavas
• Annaka Group
• Anne Formation
• Anno Formation
• Anto Andesite
• Anto Volcanic Rock Member
• Anyobo Sandstone and Mudstone Alternation Member
• Anyoji Formation
• Anzenji Tuff

• Aoba Conglomerate and Sandstone Member
• Aobayama Formation
• Aobunayama Pyroclastic Rocks and Lava
• Ao Granite
• Aoichi Basalts
• Aoiwa Conglomerate Formation
• Aoiwa Conglomerate Member
• Aoiwatani Formation
• Aojiki Basalt
• Aoki Formation
• Aoki Granite
• Aokiite
• Aokiyama Formation
• Aoni Basalt Member
• Aoni Formation
• Aonigawa Lavas
• Aoni Tuff
• Aonomine Group
• Aosawa Basaltic Tuff Breccia Member
• Aosawa Formation
• Aoshima Facies
• Aoshima Formation
• Aoso Formation
• Aoyagi Formation
• Aoyagi Loam
• Aoyagi Member
• Aoyagi Scoria
• Aoyagi Terrace Deposit
• Aoyama Basalt

• AP
• APm
• Appidakechienosawa Lava
• Appidake Lava
• Apronjo Lava

• Ar
• Ar-I
• Ar-II
• Ar-III
• Ar-IV
• Ar-V
• Arahama Sand Dune
• Arahama Sand Dune I
• Arahama Sand Dune II
• Arai Mud Member
• Araizawagawa Lava
• Araizawa Lava
• Arakawa Dolerite
• Arakawa Formation
• Arakawa Group
• Arakawa Pyroclastic Rocks
• Arakida Formation
• Arakigawa Formation
• Arakura Formation
• Arakuragawa Lava
• Arakurayama Formation
• Arakurayama Pyroclastic Member
• Arakurayama Tuff Breccia Member
• Aramachi Formation
• Arao Formation
• Arare
• Arasawadake Dacite-Quartz Porphyry Complex
• Arasawa Formation
• Arasehara Pyroclastic Rocks
• Arato Formation
• Aratozaki Formation
• Araya facies
• Araya Formation
• Arayashiki Member
• Arg
• Arg-1
• Arg-2
• Ariake Clay Formation
• Ariake Granite
• Arida Formation
• Ariga Formation
• Ariga Lignite Member
• Arimagawa Mudstone Member
• Arima Group
• Arimine Acidic Volcanic Rocks
• Arimine Formation
• Arimine Group
• Ariminehigashitani Formation
• Ariminenishitani Formation
• Arimine Shale
• Arimine Tunnel Lava
• Arinesawa Lava
• Arinotowatari Lava
• Arisu Formation
• Ar-TB
• Arugatoge Body

• AS23-25
• AS-4
• As-A
• Asabu Sandstone Member
• Asadagiri Sands and Mud
• Asadokoro Formation
• Asagai Formation
• Asagaridani Granodiorite
• Asago body
• Asahi Body
• Asahidaira Lava and Pyroclastic Rock
• Asahidake South Lavas
• Asahidake Subgroup
• Asahidake Summit Pyroclastic Rock
• Asahidake Upper Pyroclastic Rock and Lava
• Asahidake volcanic edifice
• Asahidake West Lower Lavas
• Asahidake West Upper Lava and Pyroclastic Rock
• Asahidaki Basalt
• Asahi Formation
• Asahigawa Formation
• Asahimori Rhyolite
• Asahi Mountains Younger Granites
• Asahinadake Lava
• Asahinadake volcano
• Asahiyama Agglomerate Beds
• Asahiyama Andesite Member
• Asahiyama Formation
• Asahiyama Lava, Mount Karitasan
• Asahiyama Lava, Mount Shigayama
• Asaji Metamorphic Rocks
• Asakariyama Lava
• Asakawa Formation, Nagano pref.
• Asakawa Formation, Ibaraki pref.
• Asakawa Member
• Asakawa Mudstone Member
• Asakura Granodiorite
• Asakusa volcano
• Asakusazawa Pyroclastic Flow Deposit
• Asama-Eboshi volcanoes
• Asamahara Rhyolite
• Asamayama volcano
• Asamigawa Member
• Asanai Terrace Deposit
• Asari Group
• As-B
• As-BP
• As-C
• As-MP
• As-YP
• Aseishigawa Basalt
• Asemigawa Unit
• Ashidaira Lava
• Ashidaira Pyroclastic Rocks
• Ashigara Group
• Ashigawa Formation
• Ashigeta Formation
• Ashiharahira type, Miyako Granite
• Ashi-jima Mass
• Ashikaga Body
• Ashikajima Formation
• Ashikawa type
• Ashikita Group
• Ashino Pyroclastic Flow Deposit
• Ashio Belt
• Ahio Rhyolite
• Ashio Rhyolitic Welded Tuff
• Ashiu Sandstone Member
• Ashizawa Formation, Yamagata pref.
• Ashizawa Formation, Futaba Group
• As-K
• Aso-1 Pyroclastic Flow Deposits
• Aso-2 Pyroclastic Flow Deposits
• Aso-3 Pyroclastic Flow Deposits
• Aso-4
• Aso-4A
• Aso-4B
• Aso-4 Pyroclastic Flow Deposits
• Aso-4T
• Asogawa Shale and Tuff Member
• Aso Group
• Asojima I Tuff
• Asojima II Tuff
• Asojima Formation
• Aso Limestone
• Asou Formation
• Aso volcano
• As-Sj
• Asso Formation
• As-SP
• As-UG

• AT
• At-1
• At-2
• At-3
• At-3low
• At-3up
• At-4
• At-5
• Ata
• Atagoyama Formation
• Atagoyama Group
• Atagoyama Unit
• Atagoyama volcano
• Atakawa Lava
• Atami Tuff
• Ata-Th
• Ato Formation
• Atokura Conglomerate Member
• Atokura Formation
• Atokura Nappe
• Atoroku Formation
• Atosanupuri I Lava Dome
• Atosanupuri II Lava Dome
• Atosanupuri Pyroclastic Flow Deposit
• Atosanupuri Somma Lava
• Atosanupuri volcano
• Atosugiyama Formation
• Atotsugawa Formation
• Atotsugawa Group
• Atsuchi Mudstone Member
• Atsu Group
• Atsumidake Formation
• Atsumi Dolerite
• Atsumi Group, Yamagata pref.
• Atsumi Group, Aichi pref.
• Atsuta Formation
• Attari Formation

• AUP

• Awa Group
• Awagura Formation
• Awagura Tuff Formation
• Awakura Formation
• Awano Conglomerate and Sandstone Member
• Awano Formation
• Awano Group
• Awanotaki Tuff Breccia Member
• Awashima Dolerites
• Awashima Formation
• Awashima Shale Member
• Awashimaura Dolerites
• Awazawa Formation
• Awazu Formation
• AWP

• Aya Formation
• Ayagawa Formation
• Ayakita Formation
• Ayama Formation
• Ayamedaira Lava
• Ayamedaira volcano
• Aya Member
• Ayaminamigawa Formation
• Ayasegawa Terrace Deposit
• Ayukawa Formation, Miyagi pref.
• Ayukawa Formation, Ibaraki pref.
• Ayukawa Formation, Hitachi Metamorphic Rocks
• Ayukawa Group
• Ayukawa Slate Formation

• Azamihira Hornblende Tuff
• Azamizawa Formation
• Azechi Sandstone and Conglomerate Member
• Azegamaru Body
• Azenotani Mudstone Member
• Az-FK
• Az-IS
• Az-JP1
• Az-JP2
• Az-JP3
• Az-JP4
• Az-JP5
• Az-JP6
• Az-JP7
• Az-KF
• Az-OA
• Az-OK
• Az-SK
• Azuma Formation
• Azuma-Fukushima Tephra
• Azumagawa Rhyolite Member
• Azuma-Sakuma Tephra
• Azuma volcano
• Azumaya Lavas
• Azumaya volcano
• Azumezawa Formation
• Azuyama Formation
• Azy-SgP2