List of geological units in Chiba prefecture

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A list of stratigraphic units, igneous bodies, and geological structures reported from Chiba prefecture, Kanto region, Honshu island, Japan.

Photographs of geological units in Chiba prefecture

Permian (298.9-252.17 Ma)

Takagami Conglomerate

Jurassic (201.3-145.0 Ma)

Atagoyama Unit: Kurohae Formation

Cretaceous (145.0-66.0 Ma)

Choshi Group: Nagasakihana Formation; Toriakeura Formation; Inubozaki Formation; Kimigahama Formation; Ashikajima Formation

Kuroiwa formation

Eocene - Miocene

Mineoka Belt

Mineoka Group: Nagime Formation; Enokibatake Formation; Hatcho Formation; Shirataki Formation; Sanno Formation

Mineoka Body

Oligocene - Miocene

Furubo Formation: Ishibatake Conglomerate Member; Kamogawa Basalt

Takazuru Formation

Nabuto Formation

Emi Formation

Furubo Sandstone and Volcanic rock formation

Takatsuruyama Tuffaceous rock formation

Kojima Formation

Miocene (23.03-5.33 Ma)

Meotogahana Formation

Senninzuka Formation

Nishi Basalt

Ok tuff bed

Am5 pumice bed

Miocene - Pliocene

Mineoka Belt

Awa Group

Amatsu Formation: Senbatake Conglomerate Member; Kominato Tuff Member; Mane Mudstone Member

Kinone Formation

Sakuma Formation: Nakaobara Formation; Okuyama Formation; Okuzure Formation

Kanigawa Formation

Fukawa Formation (�ӂ��)

Minamiboso Group: Koura Formation; Kohama Formation; Haraoka Formation; Ishido Formation; Azuma Formation; Iwaibukuro Formation; Namuya Formation

Nishizaki Formation

HG Tephra

Pliocene (5.33-2.58 Ma)

Mineoka Belt

Awa Group

Anno Formation: Kunawa Sandstone Member; Sak slump; Amg slump; Tkw slump; Tak slump

Kiyosumi Formation

Minamiboso Group: Kagamigaura Formation; Hedate Formation

Inubo Group: Naarai formation

Inubo Group: Naarai Formation

Chikura Group

Shiramazu Formation

Shirahama Formation: Nojimazaki Conglomerate Member

Sakahata formation

Hk tuff bed

SH Tephra: SH-A Tephra; SH-B Tephra; SH-C Tephra

GP Tephra

HI Tephra: HI-A Tephra; HI-B Tephra; HI-C Tephra

KY1 tuff bed

An-6 tuff bed

Kr tuff bed

Pliocene-Pleistocene

Inubo Group: Toyosato Formation; Kurahashi Formation; Yokone Formation; Obama Formation; Kasuga Formation

Chikura Group

Mera Formation: Rendaiji Conglomerate Member

Pleistocene (2.58- 0.01Ma)

Chikura Group

Hata Formation: Nagaogawa Sand Member

Kazusa Group

Kongochi Formation: Nishiyama Member; Ichinono Member

Tsurumai subgroup

Kasamori Formation: Kouri Sand Member; Yoro Sand Member; Sunami Sandstone Member; Sanuki Mudstone Member; Nagahama Sand and Gravel Member

Mandano Formation

Akimoto subgroup

Iwasaka formation

Awakura formation

Higashihigasa Formation

Chonan Formation

Ichijiku Formation

Kakinokidai Formation

Kokumoto formation

Umegase formation: Hosono Mollusca Bed; Kaburai Mollusca Bed; Tsujimori Mollusca Bed

Seki subgroup

Takamizo formation

Tomiya Formation

Otadai Formation

Kiwada Formation: Tmz slump

Toyofusa Group: Takigawa Formation; Higashinagata Formation; Kamo Formation; Ikenouchi Formation; Hongo Formation; Oi Formation

Iioka formation

Toyooka formation

Shimosa Group

Joso Formation: Joso Clay; Anesaki Formation

Ryugasaki formation

Kioroshi Formation: Sakurai shell bed; Toyonari shell bed

Jizodo Formation: Tanbara Mollusca Bed; Jizodo Mollusca Bed; Izumiyatsu Member; Izumiyatsu Mollusca Bed

Semata formation

Morozaki formation

Katori Formation

Naruto formation

Ichihara I Terrace Deposits

Ichihara II Terrace Deposits

Ichihara III Terrace Deposits

Nanso I Terrace Deposits

Nanso II Terrace Deposits

Nanso III Terrace Deposits

Ohorigawa Terrace Deposits

Futtsu I Terrace Deposit

Futtsu II Terrace Deposit

Futtsu III Terrace Deposit

Isumi 1 (Yoshifu) Terrace Deposits

Isumi 1 Terrace Deposits

Isumi 2 Terrace Deposits

Isumi 3 Terrace Deposits

Nagaogawa I Terrace Deposit

Nagaogawa II Terrace Deposit

Nagaogawa III Terrace Deposit

Nagaogawa IV Terrace Deposit

Nagaogawa V Terrace Deposit

Nagaogawa VI Terrace Deposit

Kanto Loam: Tachikawa Loam; Musashino Loam; Shimosueyoshi Loam

Tokyo pumice bed (TP)

Miura pumice bed (MP)

Obaradai pumice bed (OP)

On-Pm1 Tephra

An1 Tephra, Anesaki Formation

An2 Tephra, Anesaki Formation

An1 Tephra, Anno Formation

An2 Tephra, Anno Formation

O1 Tephra

O2 Tephra

O18 Tephra: JA-O18L Tephra

Sanshoku Ice pumice bed (SIP)

TAu-12 tuff bed

Aira-Tn tuff bed (AT)

KmP-5 tuff bed

KmP-1 pumice bed

Sanshokuki pumice bed (SP)

CCP-1 pumice bed

Kn-1 tuff bed

TE-5 tuff bed

GOP1 tuff bed (Gomashio-1 pumice bed)

TB-8 tuff bed

TAm-5 tuff bed

Tanzawa-garnet Pumice Bed (Tn-GP)

Holocene (0.01-0 Ma)

Kaizuka shell bed

Mobara shell bed

Numa formation

Kururi Terrace Deposits

Futtsu IV Terrace Deposit

Futtsu V Terrace Deposit

Futtsu I Cuspate Deposit

Futtsu II Cuspate Deposit

Koitogawa Delta Deposit

Fukuhara Terrace Deposits

Izumi Terrace Deposits

Choja Terrace Deposits

Numa I Terrace Deposit

Numa II Terrace Deposit

Numa III Terrace Deposit

Numa IV Terrace Deposit

Kamogawa Terrace Deposit

Nagaogawa VII Terrace Deposit

Os-Nm Tephra

Age unknown

TM1 tuff bed

TM2 tuff bed

TM3 tuff bed

AM83 tuff bed

Nakahara formation (Koduka formation)

Emi group

Ichiibara formation

Hata formation

Emi formation: Yoshiura formation; Magarimatsu tuff bed

Utono formation

Sorogawa formation

Higata shell bed

Nakura formation

Takiguchi formation

Geological structures

Kurotaki unconformity

Tokyo bay unconformity

Flower park anticline

Bentendo syncline

Merahama syncline

Nokogiriyama syncline