Tagpochau Limestone (Miocene of Northern Mariana Islands)

Where: Northern Mariana Islands (15.0° N, 145.6° E: paleocoordinates 15.0° N, 148.0° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Tagpochau Limestone Formation, Early/Lower Miocene (23.0 - 16.0 Ma)

• STRATIGRAPHIC RELATIONS: From the Tagpochau Lmst, which overlies the Fina Sisu Fm (Early Miocene), and is unconformably overlain by Late Miocene raised terrace deposits and the Mariana Limestone. AGE: Early Miocene on the basis of foraminiferal biostratigraphy. STRATIGRAPHIC POSITION: Composite list undifferentiated Mariana Limestone localities.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified limestone

• ENVIRONMENT: Shallow carbonate facies.
• SPECIFIC LITHOLOGY: Limestone facies. LITHIFICATION: Lithified, on the basis of figured specimens.

Size class: macrofossils

Preservation: cast, mold/impression

Reposited in the USNM

Collection methods: surface (in situ),

• COLLECTORS: Multiple collectors, including Cloud, Schmidt, and Burke (1948-1949), and Ladd (1958). REPOSITORY: USNM (formely USGS collections).

Primary reference: H. S. Ladd. 1966. Chitons and Gastropods (Haliotidae through Adeorbidae) from Western Pacific Islands. United States Geological Survey Professional Paper 531:1-98 [A. Hendy/A. Hendy/J. Millet]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 77942: authorized by Austin Hendy, entered by Austin Hendy on 23.01.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Not quite exhaustive, but comprehensive for gastropods. Bivalves not covered in publications. NOMENCLATURE: Authoritative publication, with moderately modern nomenclature, with subgenus and species-resolution assignments.
Gastropoda
 Neritoina - Neritopsidae
"Neritopsis (Neritopsis) radula" = Neritopsis radula
"Neritopsis (Neritopsis) radula" = Neritopsis radula Linnaeus 1758 snail
 Neogastropoda - Buccinidae
Cantharus (Pollia) sp.2 Sowerby 1843 true whelk
 Neogastropoda - Muricidae
Thais (Cymia) aff. carinifera2 Lamarck 1822 murex snail
 Stromboidea - Strombidae
Terebellum (Terebellum) terebellum1 Linnaeus 1758 true conch
 Xenophoroidea - Xenophoridae
Xenophora "sp. B"1 Fischer von Waldheim 1807 carrier shell
 Tonnoidea - Cassidae
Cassis cf. cornuta2 Linnaeus 1758 snail
 Sorbeoconcha - Campanilidae
"Cerithium (Thericium) schmidti" = Thericium1
"Cerithium (Thericium) schmidti" = Thericium1 snail
 Sorbeoconcha - Potamididae
 Sorbeoconcha - Turritellidae
"Turritella (Turritella) cf. javana" = Zaria javana1, Turritella (Turritella) aff. spolongensis1, "Turritella (Turritella) aff. sedanensis" = Haustator sedanensis1
"Turritella (Turritella) cf. javana" = Zaria javana1 Martin 1882 turret shell
"Turritella (Turritella) aff. sedanensis" = Haustator sedanensis1 Martin 1905 turret shell
 Trochoidea - Trochidae
"Thalotia (Beraua) sp." = Cantharidus (Beraua)
"Thalotia (Beraua) sp." = Cantharidus (Beraua) Beets 1941 top snail