Loc. 6109 (cycle W-11) - Waita Formation: Early Oligocene, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Thecostraca
Cirripedia indet. Rafinesque 1816
15 specimens
COMMENTS: Listed as "barnacles"
Gastropoda - Neogastropoda - Muricidae
2 specimens
COMMENTS: spelled "Phylonoyus"
Gastropoda - Trochidae
"Diloma" sp. Philippi 1845
5 specimens
Bivalvia - Carditida - Crassatellidae
25 specimens
Bivalvia - Carditida - Carditidae
2 specimens
Bivalvia - Venerida - Veneridae
4 specimens
5 specimens
Bivalvia - Arcida - Glycymerididae
12 specimens
Bivalvia - Pectinida - Pectinidae
Chlamys sp. Röding 1798
27 specimens
Bivalvia - Pectinida - Anomiidae
Monia sp. Gray 1850
29 specimens
unclassified
Annelida indet. Lamarck 1809
2 specimens
COMMENTS: Listed as "calcareous tube of Serpulid worm"
Echinoidea - Clypeasteroida - Astriclypeidae
2 specimens
see common names

Geography
Country:Japan
Coordinates: 33.8° North, 130.5° East (view map)
Paleocoordinates:36.3° North, 127.3° East (Wright 2013)
Geographic resolution:outcrop
Time
Period: Paleogene Epoch: Oligocene
Stage: Rupelian 10 m.y. bin: Cenozoic 4
Key time interval: Early Oligocene
Age range of interval: 33.9 - 27.3 m.y. ago
Stratigraphy
Formation:Waita
Stratigraphic resolution:bed
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Waita Fm, which overlies the Honjo Fm of the Ashiya Gp. THICKNESS: From individual bed within formation that reaches 450 m in thickness. AGE: latest Early Oligocene according to Sakakura (2002) on the basis of calcareous nannoplankton and foraminifera (see Saito and Okada, 1984; Tsuchi et al., 1987). STRATIGRAPHIC POSITION: From cycle W-11, near top of formation.
Lithology and environment
Primary lithology:bioturbation poorly lithified sandstone
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Bioturbated sandstone. LITHIFICATION: Poorly lithified on the basis of figured specimens and age.
Environment:transition zone/lower shoreface
Glacial or sequence phase:transgressive
Geology comments: ENVIRONMENT: Shallow shelf to offshore siliciclastic environment. From transgressive phase of relative sea-level fluctuation.
Taphonomy
Modes of preservation:body
Degree of concentration:concentrated
Size of fossils:macrofossils
Preservation of anatomical detail:excellent
Abundance in sediment:abundant
Spatial resolution:allochthonous
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taphonomic analysis
Collection method comments: COLLECTOR: Presumably Sakakura (c. 2002). REPOSITORY: Possibly Kyoto University, Kyoto, Japan.
Taxonomic list comments:COVERAGE: Exhaustive for bivalvia, gastropoda, and inclusive of scaphopods, cirripeds, and echinoids. NOMENCLATURE: Not an authoritative publication, but utilizing relatively modern nomenclature, though not assigned subgenus-level identifications and many occurrences lacking species names.
Metadata
Database number:70764
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2007-04-04 18:24:14 Last modified:2025-02-22 15:12:02
Access level:authorizer only Released:2008-04-04 18:24:14
Creative Commons license:CC0
Reference information

Primary reference:
23726. N. Sakakura. 2002. Taphonomy of bivalve assemblages in the upper part of the Paleogene Ashiya Group, southwestern Japan. Paleontological Research 6(1):101-120 [A. Hendy/A. Hendy]

Secondary references:

23698 Y. Honda. 1989. Paleogene molluscan faunas from the Kushiro Coal Field, Eastern Hokkaido. Tohoku University, Science Report, 2nd series 60(1):1-137 [A. Hendy/A. Hendy]