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Middle Yezo - Mikasa Sandstone, Hokkaidō Prefecture, Japan

Group	Middle Yezo
Formation	Mikasa Sandstone
Age:	93.9 - 89.8 Ma Late/Upper Cretaceous
Interval	Turonian
Lithology	sandstone/mudstone
Number of Collections	9
Number of Occurrences	69

Recorded Sample Locations

Location	Region	Stratigraphic Name
Ikushumbetsu Area	Mikasa City, Sorachi Subprefecture, Hokkaidō Prefecture, Japan	Middle Yezo - Mikasa Sandstone
Yubari Area	Yubari District, Sorachi Subprefecture, Hokkaidō Prefecture, Japan	Middle Yezo - Mikasa Sandstone
Manji Area	Sorachi Subprefecture, Hokkaidō Prefecture, Japan	Middle Yezo - Mikasa Sandstone
Oyubari Area	Yubari District, Sorachi Subprefecture, Hokkaidō Prefecture, Japan	Middle Yezo - Mikasa Sandstone
Bibai Area	Sorachi Subprefecture, Hokkaidō Prefecture, Japan	Middle Yezo - Mikasa Sandstone
Obirashibe Area	Rumoi Subprefecture, Hokkaidō Prefecture, Japan	Middle Yezo - Mikasa Sandstone

Associated Units

Stratigraphic Name	Age	Lithology	Occurrence Records
Saku	93.5 - 89.3 Ma Late/Upper Cretaceous	mudstone, mudstone/sandstone, sandstone	181
Hakobuchi	70.6 - 66.0 Ma Late/Upper Cretaceous	sandstone/siltstone, siltstone/sandstone	41
Lower Yezo	113 - 101 Ma Early/Lower Cretaceous	sandstone/"shale", wackestone/packstone	10
Middle Yezo - L2	113 - 101 Ma Early/Lower Cretaceous	shale/sandstone	2
Upper Yezo	83.6 - 72.1 Ma Late/Upper Cretaceous	mudstone	52
Yezo	83.6 - 72.1 Ma Late/Upper Cretaceous	mudstone/sandstone, claystone, siltstone, sandstone, "limestone"/sandstone, "carbonate", "siliciclastic", mudstone	117

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Cucullaea (Idonearca) ezoensis species	7	Animalia : Mollusca : Bivalvia : Arcida : Cucullaeidae : Cucullaea : *Cucullaea (Idonearca) ezoensis*	93.9 - 89.8 Ma Late/Upper Cretaceous
Cucullaea truncata species	7	Animalia : Mollusca : Bivalvia : Arcida : Cucullaeidae : Cucullaea : *Cucullaea truncata*	93.9 - 89.8 Ma Late/Upper Cretaceous
Glycymeris (Glycymerita) sp. subgenus	6.3	Animalia : Mollusca : Bivalvia : Arcida : Glycymerididae : Glycymeris : *Glycymeris (Glycymerita)*	93.9 - 89.8 Ma Late/Upper Cretaceous
Glycymeris (Hanaia) hokkaidoensis species	7	Animalia : Mollusca : Bivalvia : Arcida : Glycymerididae : Glycymeris : *Glycymeris (Hanaia) hokkaidoensis*	100.5 - 93.9 Ma Late/Upper Cretaceous
Trigonarca sp. genus	6	Animalia : Mollusca : Bivalvia : Arcida : Glycymerididae : *Trigonarca*	93.9 - 89.8 Ma Late/Upper Cretaceous
Meekia sp. genus	6	Animalia : Mollusca : Bivalvia : Cardiida : Tancrediidae : *Meekia*	100.5 - 93.9 Ma Late/Upper Cretaceous
Eriphyla (Eriphyla) sp. subgenus	6.3	Animalia : Mollusca : Bivalvia : Carditida : Astartidae : Eriphyla : *Eriphyla (Eriphyla)*	100.5 - 93.9 Ma Late/Upper Cretaceous
Anthonya sp. genus	6	Animalia : Mollusca : Bivalvia : Carditida : Crassatellidae : *Anthonya*	100.5 - 93.9 Ma Late/Upper Cretaceous
Thetis japonica species	7	Animalia : Mollusca : Bivalvia : Lucinida : Mactromyidae : Thetis : *Thetis japonica*	100.5 - 93.9 Ma Late/Upper Cretaceous
Inoceramus (Inoceramus) sp. subgenus	6.3	Animalia : Mollusca : Bivalvia : Myalinida : Inoceramidae : Inoceramus : *Inoceramus (Inoceramus)*	100.5 - 93.9 Ma Late/Upper Cretaceous
Inoceramus crippsi species	7	Animalia : Mollusca : Bivalvia : Myalinida : Inoceramidae : Inoceramus : *Inoceramus crippsi*	100.5 - 93.9 Ma Late/Upper Cretaceous
Crenella sp. genus	6	Animalia : Mollusca : Bivalvia : Mytilida : Mytilidae : *Crenella*	93.9 - 89.8 Ma Late/Upper Cretaceous
Lycettia sp. genus	6	Animalia : Mollusca : Bivalvia : Mytilida : Mytilidae : *Lycettia*	100.5 - 93.9 Ma Late/Upper Cretaceous
Pseudoptera sp. genus	6	Animalia : Mollusca : Bivalvia : Ostreida : Bakevelliidae : *Pseudoptera*	93.9 - 89.8 Ma Late/Upper Cretaceous
Entolium sp. genus	6	Animalia : Mollusca : Bivalvia : Pectinida : Entoliidae : *Entolium*	93.9 - 89.8 Ma Late/Upper Cretaceous
Megatrigonia (Apiotrigonia) sp. subgenus	6.3	Animalia : Mollusca : Bivalvia : Trigoniida : Trigoniidae : Megatrigonia : *Megatrigonia (Apiotrigonia)*	100.5 - 93.9 Ma Late/Upper Cretaceous
Apiotrigonia (Apiotrigonia) sp. subgenus	6.3	Animalia : Mollusca : Bivalvia : Trigoniida : Trigoniidae : Megatrigonia : *Apiotrigonia (Apiotrigonia)*	100.5 - 93.9 Ma Late/Upper Cretaceous
Pterotrigonia (Acanthotrigonia) sp. subgenus	6.3	Animalia : Mollusca : Bivalvia : Trigoniida : Megatrigoniidae : Pterotrigonia : *Pterotrigonia (Acanthotrigonia)*	100.5 - 93.9 Ma Late/Upper Cretaceous
Pterotrigonia (Pterotrigonia) sp. subgenus	6.3	Animalia : Mollusca : Bivalvia : Trigoniida : Megatrigoniidae : Pterotrigonia : *Pterotrigonia (Pterotrigonia)*	100.5 - 93.9 Ma Late/Upper Cretaceous
Pterotrigonia (Scabrotrigonia) sp. subgenus	6.3	Animalia : Mollusca : Bivalvia : Trigoniida : Megatrigoniidae : Pterotrigonia : *Pterotrigonia (Scabrotrigonia)*	100.5 - 93.9 Ma Late/Upper Cretaceous
Steinmanella sp. genus	6	Animalia : Mollusca : Bivalvia : Trigoniida : Steinmanellidae : *Steinmanella*	100.5 - 93.9 Ma Late/Upper Cretaceous
Cymbophora sp. genus	6	Animalia : Mollusca : Bivalvia : Venerida : Mactridae : *Cymbophora*	100.5 - 93.9 Ma Late/Upper Cretaceous
Pseudasaphis sp. genus	6	Animalia : Mollusca : Bivalvia : Sphaeriida : Neomiodontidae : *Pseudasaphis*	100.5 - 93.9 Ma Late/Upper Cretaceous
Aphrodina sp. genus	6	Animalia : Mollusca : Bivalvia : Hippuritida : Cycloconchidae : *Aphrodina*	100.5 - 93.9 Ma Late/Upper Cretaceous

References

Hayami I. (1975) A systematic survey of the Mesozoic Bivalvia from Japan, The University Museum, The University of Tokyo, Bulletin 10

Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!