Oyamada-mura: Burdigalian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Osteichthyes - Cetacea
1 specimen
(1 measurement)
Osteichthyes - Cetacea - Allodelphinidae
Kimura et al. 2011 1 specimen
see common names

Geography
Country:Japan State/province:Mie County:Ayama
Coordinates: 34.8° North, 136.3° East (view map)
Paleocoordinates:34.6° North, 133.6° East (Wright 2013)
Basis of coordinate:stated in text
Time
Period: Neogene Epoch: Miocene
Stage: Burdigalian 10 m.y. bin: Cenozoic 5
Key time interval: Burdigalian Foram zone:  N7
Age range of interval: 20.45 - 15.98 m.y. ago
Age estimate: 17.5 to 16.0 Ma (other)
Stratigraphy
Geological group:Awa Member:Hiramatsu
Stratigraphic resolution:member
Stratigraphy comments: Zone N7 of Blow (1969)

Planktonic foraminiferal data place the Hiramatsu Member of the Awa Group in zone N7 [132, 133], ranging from 17.5–16.4 Ma [20, 54]; and the Yamanouchi Member of the Ayeko Formation in the upper part of zone N7 and the lower part of zone N8 [134], with zone N8 ranging from 16.4–15.1 Ma [20, 54]. Fission-track dating of a sample from the base of the Yamanouchi Member indicates an age of 17.3 ± 1.4 Ma [135]. Although the termination of zone N8 at 15.1 Ma could imply a partially Langhian range, we here constrain the age of I. laticephalus to the late Burdigalian (17.5–16.0 Ma) based on (i) the confirmed Burdigalian age of MFM 28501; (ii) the fact that the lower boundary of the Yamanouchi Member predates the Burdigalian/Langhian boundary by as much as 1 Ma, or possibly more; and (iii) the fact that the Yamanouchi Member was only correlated with the lower part of zone N8. (Marx & Fordyce, 2015)
Lithology and environment
Primary lithology: sandstone
Includes fossils?Y
Lithology description: sandstone, sandy mudstone, coglomerate
Environment:marine indet.
Geology comments: upper to middle bathyal under warm current
Taphonomy
Modes of preservation:body,original phosphate
Size of fossils:macrofossils
Preservation of anatomical detail:excellent
Collection methods and comments
Collection methods:selective quarrying,surface (in situ),field collection
Reason for describing collection:taxonomic analysis
Metadata
Also known as:Iga City
Database number:46946
Authorizer:M. Uhen Enterer:M. Uhen
Modifier:M. Uhen Research group:vertebrate
Created:2005-01-27 07:13:09 Last modified:2025-02-22 15:12:02
Access level:database members Released:2005-04-27 07:13:09
Creative Commons license:CC0
Reference information

Primary reference:
12471. T. Kimura and T. Ozawa. 2002. A new cetothere (Cetacea: Mysticeti) from the early Miocene of Japan. Journal of Vertebrate Paleontology 22(3):684-702 [M. Uhen/M. Uhen/M. Uhen]

Secondary references:

36624 T. Kimura, L. G. Barnes, and M. A. Rivin. 2011. The platanistoid family Allodelphinidae, and a new Early Miocene species from central Japan. Sixth Triennial Converence on Secondary Adaptation of Tetrapods to Life in Water 44-45 [M. Uhen/M. Uhen]