Montañita/Olón: Chattian, Ecuador
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
- Testudines
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Chelonioidea (informal Pan-Cheloniidae) indet.
(Baur 1893)
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Cadena et al. 2018 | 1 specimen | |||||
Mammalia
- Cetacea
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Urkudelphis chawpipacha n. gen., n. sp.
Tanaka et al. 2017
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1 specimen | ||||||
Chondrichthyes
- Lamniformes
- Otodontidae
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Carcharocles angustidens
(Agassiz 1835)
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recombined as Otodus (Carcharocles) angustidens | |||||||
see common names |
Geography
Country: | Ecuador | State/province: | Santa Elena |
Coordinates: | 1.8° South, 80.8° West (view map) | ||
Paleocoordinates: | 3.6° South, 75.5° West |
Time
Period: | Paleogene | Epoch: | Oligocene |
Stage: | Chattian | 10 m.y. bin: | Cenozoic 4 |
Key time interval: | Chattian | ||
Age range of interval: | 28.10000 - 23.03000 m.y. ago |
Stratigraphy
Formation: | Dos Bocas | Member: | Zapotal | ||
Stratigraphy comments: Here, we provisionally identify the source horizon for MO-1 as the Zapotal Member of the Dos Bocas Formation, with names following Whittaker [25]. More study is needed to establish the proper terminology of the coastal strata outside, but closely-related to, the Progreso Basin. We did not find foraminiferans that might be used for dating. The presence of Carcharocles angustidens is consistent with a late Oligocene age suggested by Bristow. Elsewhere, in the East Pisco basin of Peru, C. angustidens is not reported from the vertebrate-bearing Chattian to Burdigalian Chilcatay Formation, in which the richest vertebrate-bearing horizon is Burdiga- lian [29–31]), but occurs in older units (M. Urbina and A. Altamirano (Departamento de Paleontolog ́ıa de Vertebrados, Museo de Historia Natural, Universidad Nacional Mayor de San Marcos), personal communication, fide T.J. DeVries (Burke Museum of Natural History and Culture, University of Washington, Seattle)). Thus, the age of MO-1 is consistent with a probable Chattian age (24 to 26 Ma), as shown by Bristow [23] (his Fig 3, Zapotal Member of Tosagua Formation).
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Lithology and environment
Primary lithology: | sandstone |
Includes fossils? | Y |
Lithology description: composed of a moder- ately-sorted, fine to medium sandstone with angular quartzo-feldspathic clasts. Conspicuous rounded green grains are probably glauconite, but berthierine cannot be dismissed. The matrix is micritic and volcanogenic, possibly bentonitic. Bedding is massive to indistinct | |
Environment: | coastal indet. |
Geology comments: quiet setting; estuarine or mid-shelf |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Collection methods and comments
Reason for describing collection: | general faunal/floral analysis |
Metadata
Database number: | 190942 | ||
Authorizer: | M. Uhen, P. Holroyd | Enterer: | M. Uhen, P. Holroyd |
Modifier: | P. Holroyd | Research group: | vertebrate |
Created: | 2017-12-26 11:37:08 | Last modified: | 2018-04-19 20:07:42 |
Access level: | the public | Released: | 2017-12-26 11:37:08 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
64255. | Y. Tanaka, J. Abella, Gl Aguirre-Fernández, M. Gregori, and R. E. Fordyce. 2017. A new tropical Oligocene dolphin from Montañita/Oló, Santa Elena, Ecuador. PLoS One 12(12):e0188380 [M. Uhen/M. Uhen] |
Secondary references:
65080 | E. Cadena, J. Abella, and M. Gregori. 2018. The first Oligocene sea turtle (Pan-Cheloniidae) record of South America. PeerJ 6(e4554):1-10 [P. Holroyd/P. Holroyd] |