Jan Juc Beach: Chattian, Australia
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Mammalia
- Cetacea
- Mammalodontidae
|
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| Marx et al. 2019 | 6 specimens | |||||||||
| NMV P252884 252899 48788 254112 218279 252897 | ||||||||||
| 1 specimen | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Australia | State/province: | Victoria |
| Coordinates: | 38.4° South, 144.3° East (view map) | ||
| Paleocoordinates: | 51.1° South, 151.8° East (Wright 2013) | ||
| Basis of coordinate: | estimated from map |
Time
| Period: | Paleogene | Epoch: | Oligocene |
| Stage: | Chattian | 10 m.y. bin: | Cenozoic 4 |
| Key time interval: | Chattian | ||
| Age range of interval: | 27.3 - 23.04 m.y. ago | ||
| Age estimate: | 28.1 to 25.6 Ma (other) |
Stratigraphy
| Formation: | Jan Juc | ||||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: The Jan Juc Marl is placed mostly into the Chattian by both biostratigraphy and radiometric dating, with a minimum age of 23.9 (based on the overlying Puebla Formation) and a maximum age exceeding 27.2 Ma [138]. However, the exact position of the known material within the Jan Juc Marl is unknown. Several recent cladistic analyses, including the present study, have proposed a close relationship of Janjucetus and Mammalodon [102, 139]. Since the two taxa must have separated prior to the first occurrence of Mammalodon and its relatives during the early Chattian (see discussion of OU 22026 for further details), we here assume an early Chattian (28.1–25.6 Ma) age for Janjucetus, pending the discovery of temporally better constrained specimens. (Marx & Fordyce, 2015)
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Lithology and environment
| Primary lithology: | not reported |
| Environment: | offshore |
| Geology comments: strong water mixing, oxygen-poor, bioturbation | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | general faunal/floral analysis |
Metadata
| Database number: | 114718 | ||
| Authorizer: | M. Uhen | Enterer: | M. Uhen |
| Modifier: | B. Shipps | Research group: | vertebrate |
| Created: | 2011-08-23 07:07:52 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | database members | Released: | 2011-11-23 07:07:52 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 37187. | E. M. G. Fitzgerald. 2011. Archaeocete-like jaws in a baleen whale. Biology Letters [M. Uhen/M. Uhen] |
Secondary references:
| 18301 | T. A. Darragh. 2002. A revision of the Australian genus Umbilia (Gastropoda: Cypraeidae). Memoirs of the Museum of Victoria 59(2):355-392 [A. Miller/A. Hendy] | |
| 72000 | F. G. Marx, E. M. G. Fitzgerald, and R. E. Fordyce. 2019. Like phoenix from the ashes: How modern baleen whales arose from a fossil “dark age”. Acta Palaeontologica Polonica 64(2):231-238 [M. Uhen/M. Uhen/M. Uhen] | |
| 55050 | F. G. Marx and R. E. Fordyce. 2015. Baleen boom and bust: a synthesis of mysticete phylogeny, diversity and disparity. Royal Society Open Science 2:140434 [M. Uhen/M. Uhen] |