Zachahún Corehole - 1041 ft (Subibaja Fm): Early/Lower Miocene, Ecuador
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Neogastropoda
- Buccinidae
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Tritiaria (? Antillophos) sp.
(Woodring 1928)
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| original and current combination Antillophos | |||||||
| see common names | |||||||
Geography
| Country: | Ecuador | State/province: | Guayas |
| Coordinates: | 2.3° South, 80.4° West (view map) | ||
| Paleocoordinates: | 3.5° South, 76.3° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | small collection |
Time
| Period: | Neogene | Epoch: | Miocene |
| 10 m.y. bin: | Cenozoic 5 | ||
| Key time interval: | Early/Lower Miocene | ||
| Age range of interval: | 23.03000 - 15.98000 m.y. ago |
Stratigraphy
| Formation: | Subibaja | Member: | Saiba | ||
| Local section: | Zacachún | Local bed: | 1090 ft | ||
| Local order: | bottom to top | ||||
| Regional section: | Progresso | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: From Saiba Mbr of Subibaja Fm, which is of lower Early Miocene age, overyling the Dos Bocas Shale (Oligocene) and underlying the Zacachun Mbr of the Subibaja Fm and the Middle Miocene Progresso Fm. The thickness of the formation is 1800 ft at its type section. Age is approximately equivalent to the Burdigalian stage based on correlation with other S. and C. American faunas. It is regionally correlated with the Lower Zorritos (Peru) and Angostura (Ecuador) formations. | |||||
Lithology and environment
| Primary lithology: | gray poorly lithified sandy siltstone |
| Includes fossils? | Y |
| Lithology description: Siltstone, massive, dark gray, locally hard with calcareous cement, usually containing numerous foraminifera, garding into shaly and sandy facies. | |
| Environment: | offshore |
| Geology comments: Deep-water siliciclastic facies of typically tropical composition. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | all microfossils |
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | PRI |
| Collection method comments: Fossil material derived from the International Ecuadorian Petroleum Company (subsidiary of Standard Oil Co.) and was collected by the author (then employed by oil company) during field exploration and drilling operations. All type and voucher material reposited in PRI collections. | |
| Taxonomic list comments:Exhaustive for gastropoda and bivalvia. | |
Metadata
| Also known as: | Z-1041 | ||
| Database number: | 60716 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2006-05-21 21:34:05 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2006-05-21 21:34:05 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 17441. | J. G. Marks. 1951. Miocene stratigraphy and paleontology of Southwestern Ecuador. Bulletins of American Paleontology 33(139):1-448 [A. Miller/A. Hendy] |