2A (100-200 ft), Bikini Island: Late/Upper Pleistocene, Marshall Islands
collected by JTF 1947

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Turbinidae
Astraea (Astralium) informal sp. B (Link 1807)
Ladd 1966
original and current combination Astralium
Gastropoda - Ranellidae
Cymatium (Septa) gemmatum
Ladd 1977
original and current combination Septa
Gastropoda - Strombidae
Strombus (Euprotomus) vomer Röding 1798
Ladd 1972
Strombus gibberulus Linnaeus 1758
recombined as Strombus (Gibberulus) gibberulus
Strombus (Gibberulus) gibberulus (Linnaeus 1758)
Ladd 1972
Gastropoda - Triphoridae
Cautotriphora hervieri
Ladd 1972
Gastropoda - Cerithiopsidae
Cyrbasia (Joculator) aff. ovata
Ladd 1972
Gastropoda - Vermetidae
Petaloconchus (Macrophragma) merkana
Ladd 1972
spelled with current rank as Macrophragma
Gastropoda - Cerithiidae
Cerithium vertagus
Rhinoclavis (Rhinoclavis) vertagus (Linnaeus 1758)
Ladd 1972
Bivalvia - Cardiida - Veneridae
Lioconcha cf. picta (Lamarck 1818)
synonym of Lioconcha (Lioconcha) ornata
Ulvophyceae - Bryopsidales - Halimedaceae
Halimeda sp. Lamouroux 1812
Florideophyceae - Hapalidiales - Lithothamniacae
Lithothamnion sp. Heydrich 1897
Rotalia calcar
Calcarina sp.
Amphistegina sp. d'Orbigny 1826
Tubothalamea - Miliolida - Soritidae
Marginopora sp.
see common names

Country:Marshall Islands
Coordinates: 11.6° North, 165.4° East (view map)
Paleocoordinates:11.6° North, 165.4° East
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Period:Quaternary Epoch:Pleistocene
10 m.y. bin:Cenozoic 6
Key time interval:Late/Upper Pleistocene
Age range of interval:0.12600 - 0.01170 m.y. ago
Local section:2A Local bed:150 ft
Local order:top to bottom
Regional section:Bikini Island Regional bed:150 ft
Regional order:top to bottom
Stratigraphic resolution:group of beds
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From an undifferentiated lithostratigraphic unit. AGE: Late Pleistocene, on the basis of stratigraphic position. STRATIGRAPHIC POSITION: A composite from several beds within the section of drill core of 100-200 ft.
Lithology and environment
Primary lithology:white poorly lithified "limestone"
Includes fossils?Y
Lithology description: LITHOLOGY: White, compact, limestone, moderately to firmly cemented for the most part, but friable to unconsilidated at the very top, and chalky at the base. LITHIFICATION: Poorly lithified, on the basis facies description and figured specimens.
Environment:lagoonal/restricted shallow subtidal
Geology comments: EMVIRONMENT: Carbonate facies, abundant lagoon type mollusks. No further paleontologic data.
Modes of preservation:body,cast,mold/impression,original aragonite,replaced with calcite
Size of fossils:macrofossils,microfossils
Collection methods and comments
Collection methods:core,field collection
Reason for describing collection:taxonomic analysis
Museum repositories:USNM
Collectors:JTF Collection dates:1947
Collection method comments: COLLECTOR: Operation Crossroads, Joint Task Force One, 1947. REPOSITORY: USNM.
Taxonomic list comments:COEVERAGE: Representative, but not exhaustive of bivalvia and gastropoda. NOMENCLATURE: Mixture of some slightly antiquated and broad identifications and more modern nomenclature, subgenus- and species-level identifications from an authoritative publication. IDENTIFIER: H. S. Ladd.
Database number:43336
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2004-08-12 03:48:09 Last modified:2013-11-25 13:37:23
Access level:authorizer only Released:2005-08-12 03:48:09
Creative Commons license:CC BY
Reference information

Primary reference:

11432. K. O. Emery, J. I. Tracey, and H.S. Ladd. 1954. Geology of Bikini and nearby atolls: Part 1, Geology. United States Geological Survey Professional Paper 260(A):1-265 [A. Miller/A. Hendy/R. McClees-Funinan]

Secondary references:

26223 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]
11409 H. S. Ladd. 1972. Cenozoic fossil mollusks from Western Pacific Islands; Gastropods (Turritellidae through Strombidae). United States Geological Survey Professional Paper 532:1-79 [A. Miller/A. Hendy/A. Hendy]
11410 H. S. Ladd. 1977. Cenozoic fossil mollusks from Western Pacific Islands; Gastropods (Eratoidae through Harpidae). United States Geological Survey Professional Paper 533:1-84 [A. Miller/A. Hendy/J. Millet]