Futatsu-numa Sand, Taga Group (Pliocene of Japan)

Where: Fukushima, Japan (42.8° N, 143.0° E: paleocoordinates 42.9° N, 142.6° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: N21 foram zone, Futatsu-numa Sand Member (Tomioka Formation), Late/Upper Pliocene (3.6 - 2.6 Ma)

• LITHOSTRATIGRAPHY: From Futatsu-numa Sand (informal) member of the Tomioka Formation, Taga Group. STRATIGRAPHIC RELATIONS: From basal sand (30 m) of 100 m thick Tomioka Formation THICKNESS: 30 m thick. AGE: Molluscan biostratigraphy suggests a Pliocene age. Micropaleontological data indicates the Futatsu-numa Sand is included in the Globoratalia tosaensis Zone (N21) of the planktonic foraminiferal zonation and is contained in the Denticulopsis seminae var. fossils-Denticulopsis kamtschatica diatom Zone, and its age is estimated to fall between 2.5 and 3.5 Ma.

• member-level stratigraphic resolution

Environment/lithology: shoreface; unlithified, medium-grained, coarse sandstone

• ENVIRONMENT: High energy depositional environment based of facies; according to the writers the assemblage formed in the nearshore environment under high energy depositional conditions, with the depositional site not so far from the shoreline, judging from the ecological data of related modern taxa. THERMAL TOLERANCES: Assemblage suggests the constant influence of cold water of the Oyashio current and occasional influence by warm water of the Kuroshio current.
• SPECIFIC LITHOLOGY: Medium-coarse interbedded sand. LITHIFICATION: Unlithified, as stated in text.

Size class: macrofossils

Preservation: original aragonite, original calcite

Collection methods: bulk, quarrying,

• COLLECTOR: Presumably the authors, S. O'Hara and N. Nemoto, supplemented by collections from Y. Makino (Ibaraki University). REPOSITORY: CU (Geological Institute, Chiba University)

Primary reference: S. O'Hara and N. Nemoto. 1988. Pectinids from the Taga Group of the Joban Coalfield. Saito Ho-on Kai Special Publication 1:481-496 [A. Miller/A. Hendy/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 62295: authorized by Austin Hendy, entered by Austin Hendy on 17.07.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• COMPLETENESS: Exhaustive for Mollusca. No other groups mentioned in text. TAXONOMY: Authoritative publication, relatively modern nomenclature, species-level identifications.
unclassified
  -
Gastropoda
 Trochoidea - Turbinidae
"Pomaulax japonicus" = Astraea (Pomaulax) snail
 Trochoidea - Trochidae
"Omphalius rusticus" = Chlorostoma (Omphalius) top snail
Subspecies: O. rusticus collicus
Umbonium giganteum top snail
Subspecies: U. giganteum yamamotoi
 Seguenzioidea - Eucyclidae
Bathybembix arquenteonitens snail
Subspecies: B. arquenteonitens hirasei
 Lepetellida - Fissurellidae
Puncturella nobilis puncturella
Diodora quadriradiata Reeve 1850 snail
 Epitonioidea - Epitoniidae
Amaea thielei wentletrap
Acirsa ochotensis wentletrap
 Neotaenioglossa - Trichotropidae
 Cerithioidea - Turritellidae
 Cerithioidea - Batillariidae
 Pseudomelanoidea - Pseudomelaniidae
Inquisitor cosibensis, "Antiplanes sadoensis" = Antiplanes, "Rectiplanes motojimai" = Antiplanes, "Rectiplanes sanctiioannis" = Antiplanes
"Antiplanes sadoensis" = Antiplanes snail
"Rectiplanes motojimai" = Antiplanes snail
"Rectiplanes sanctiioannis" = Antiplanes snail
 Neogastropoda -
 Neogastropoda - Olividae
Olivella japonica olive snail
 Neogastropoda - Buccinidae
"Aulacofusus periscelidus" = Colus (Aulacofusus) true whelk
Mohnia yanamii true whelk
Neptunea fukuae true whelk
Neptunea otukai true whelk
 Neogastropoda - Columbellidae
 Neogastropoda - Clathurellidae
 Neogastropoda - Turridae
 Neogastropoda - Muricidae
Nucella lamellosa Gmelin 1791 murex snail
Nucella lapillus Linnaeus 1758 murex snail
Thais clavigera murex snail
 Neogastropoda - Volutidae
"Musashia prevostiana" = Fulgoraria (Musashia), "Musashia cf. tokunagai" = Fulgoraria (Musashia)
"Musashia prevostiana" = Fulgoraria (Musashia) volute
Subspecies: M. prevostiana
"Musashia cf. tokunagai" = Fulgoraria (Musashia) volute
 Neogastropoda - Cancellariidae
 Sorbeoconcha - Ranellidae
Fusitriton oregonensis Redfield 1846 triton shell
 Sorbeoconcha - Cypraeidae
"Adusta onyx" = Erronea (Adusta) onyx
"Adusta onyx" = Erronea (Adusta) onyx Linnaeus 1758 cowry
 Sorbeoconcha - Eratoidae
"Lachryma callosa" = Hespererato scabriuscula
"Lachryma callosa" = Hespererato scabriuscula Gray 1832 snail
 Sorbeoconcha - Velutinidae
Velutina plicatilis Müller 1776 snail
Subspecies: V. plicatilis cryptospira
 Sorbeoconcha - Littorinidae
 Sorbeoconcha - Naticidae
"Neverita didyma" = Glossaulax didyma, "Tectonatica janthostoma" = Cryptonatica janthostoma, "Tectonatica janthostomoides" = Cryptonatica andoi
"Neverita didyma" = Glossaulax didyma Röding 1798 moon snail
"Tectonatica janthostoma" = Cryptonatica janthostoma Deshayes 1839 moon snail
"Tectonatica janthostomoides" = Cryptonatica andoi Nomura 1935 moon snail
 Sorbeoconcha - Vermetidae
Serpulorbis imbricatus Dunker 1860 worm shell
 Sorbeoconcha - Triphoridae
 Heterostropha - Pyramidellidae
Turbonilla torquata Gould 1853 snail
"Odostomia gouldii" = Aartsenia gouldi Carpenter 1865 snail
 Heterostropha - Architectonicidae
 Patellida - Lottiidae
"Collisella cassis" = Lottia, Acmaea pallida
"Collisella cassis" = Lottia limpet
Bivalvia
 Arcida - Parallelodontidae
 Arcida - Arcidae
 Arcida - Cucullaeidae
"Arca boucardi" = Tetrarca boucardi
"Arca boucardi" = Tetrarca boucardi Jousseaume 1894 clam
 Arcida - Glycymerididae
 Arcida - Limopsidae
"Limopsis adamsiana" = Limopsis, "Limopsis tokaiensis" = Limopsis, "Nipponolimopsis azumana" = Limopsis
"Limopsis adamsiana" = Limopsis clam
"Limopsis tokaiensis" = Limopsis clam
"Nipponolimopsis azumana" = Limopsis clam
 Pectinida - Anomiidae
 Pectinida - Limidae
 Pectinida - Pectinoidae
"Swiftopecten swiftii" = Chlamys (Swiftopecten) swifti Bernardi 1858 scallop
Chlamys satoi Yokoyama 1928 scallop
"Chlamys iwakiana" = Chlamys (Leochlamys) iwakiana Yokoyama 1925 scallop
"Chlamys cosibensis" = Chlamys (Chlamys) cosibensis Yokoyama 1911 scallop
Gloripallium crassivenium Yokoyama 1929 scallop
Cryptopecten vesiculosus Dunker 1877 scallop
 Ostreida - Ostreidae
Crassostrea gigas Thunberg 1793 giant Pacific oyster
 Mytilida - Mytilidae
Mytilus edulis Linnaeus 1758 mussel
 Lucinida - Thyasiridae
Conchocele bisecta Conrad 1849 clam
 Lucinida - Lucinidae
"Lucinoma acutilineatum" = Lucinoma acutilineata
"Lucinoma acutilineatum" = Lucinoma acutilineata Conrad 1849 clam
 Poromyida - Cuspidariidae
 Pholadida - Pholadidae
 Pholadida - Corbulidae
"Anisocorbula venusta" = Corbula (Anisocorbula)
"Anisocorbula venusta" = Corbula (Anisocorbula) clam
 Cardiida - Corbiculidae
 Cardiida - Chamidae
Chama reflexa Reeve 1846 jewel box
 Cardiida - Veneridae
Callista adamsi venus clam
 Cardiida - Ungulinidae
 Cardiida - Mactridae
"Spisula voyi" = Mactromeris polynyma
"Spisula voyi" = Mactromeris polynyma Stimpson 1860 clam
 Cardiida - Cardiidae
"Clinocardium californiense" = Clinocardium (Keenocardium) californiense Deshayes 1839 cockle
 Cardiida - Tellinidae
"Cadella lubrica" = Tellina (Cadella), "Macoma calcarea" = Macoma (Macoma) calcarea
"Cadella lubrica" = Tellina (Cadella) tellin clam
"Macoma calcarea" = Macoma (Macoma) calcarea Gmelin 1792 tellin clam
 Carditida - Carditidae
Venericardia ferruginea Clessin 1888 clam
"Venericardia prolongata" = Miodontiscus prolongatus Carpenter 1864 clam
Subspecies: V. prolongata nakamurai
 Carditida - Crassatellidae
 Solemyida - Solemyidae
"Solemya tokunagai" = Acharax johnsoni
"Solemya tokunagai" = Acharax johnsoni Dall 1891 Awning Clam
 Nuculida - Nuculidae
"Acila mirabilis" = Acila (Acila) mirabilis
"Acila mirabilis" = Acila (Acila) mirabilis Adams and Reeve 1850 divaricate nutclam
Subspecies: A. mirabilis vigilia
 Nuculanida - Nuculanidae
Nuculana yokoyamai pointed nut clam
 Nuculanida - Sareptidae
Scaphopoda
 Dentaliida - Dentaliidae