Mandano Formation

Mandano Formation (Mitsuchi, 1933)

Invalid synonym: Mandano Sand and Gravel Member

Coherent formation
Fore-arc basin sediments (Kazusa trough)
Pleistocene
Contemporaneous heterotopic facies (Upper): Nagahama Sand and Gravel Member
Correlation: Top of Hama Formation

Water temperature (Upper): Warm ocean current
Water temperature (Lower): Cold ocean current
Lithofacies: Sands
Lithofacies (Minor): Gravels
Sedimentary structures: Cross stratification
Paleocurrent: East-northeast, North-northeast

Thickness: 0 - 70 m

Kazusa Group (central Boso peninsula)
[ Upper ]
~~~~~~~~~~~~~~
Kasamori Formation / Kongochi Formation
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Mandano Formation
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Chonan Formation
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Ichijiku Formation
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Kakinokidai Formation
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Kokumoto Formation
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Umegase Formation
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Otadai Formation
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Kiwada Formation
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Ohara Formation
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Namihana Formation
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Katsuura Formation
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Kurotaki Formation
~~~~~~~~~~~~~~
[ Lower ]

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Boso peninsula, Chiba pref.
Fossils (Shellfishes): Aequipecten vesiculosus, Batillaria multiformis, Cryptonatica janthostomoides, Glycymeris pilsbryi, Glycymeris yessoensis, Limopsis crenata, Limopsis obliqua, Mercenaria stimpsoni, Mya arenaria oonogai, Nemocardium samarangae, Neptunea arthritica, Peronidia venulosa, Potamocorbula amurensis, Spisula sybillae
Fossils (Foraminifera): Cassidulina sp., Cibicides sp., Elphidium crispum, Miliolidae, Pararotalia nipponica, Pulleniatina obliquiloculata, Sphaeroidinella deiscens

GSSP proposal group (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.5-22 DOI
Tokuhashi and Endo (1984) Geology of the Anesaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 6p.)