Marks (1951) IPC# 1456 (Blue Siltstone Mbr, Daule Fm): Middle Miocene, Ecuador
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Neogastropoda
- Conidae
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Conus bravoi
(Spieker 1922)
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Bivalvia
- Arcida
- Noetiidae
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Noetia dauleana
Marks 1951
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Bivalvia
- Arcida
- Arcidae
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Anadara thalia
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| see common names | |||||||
Geography
| Country: | Ecuador | State/province: | Guayas |
| Coordinates: | 1.7° South, 80.3° West (view map) | ||
| Paleocoordinates: | 2.5° South, 77.3° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Miocene |
| 10 m.y. bin: | Cenozoic 5 | ||
| Key time interval: | Middle Miocene | ||
| Age range of interval: | 15.98000 - 11.63000 m.y. ago |
Stratigraphy
| Formation: | Daule | Member: | Blue Siltstone | ||
| Local section: | Jerusalem | ||||
| Regional section: | Daule | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: From Daule Fm, which is of Middle Miocene age comprises three members, a "basal calcareous" member, a middle "blue siltstone" member, and an "upper calcareous" member. The exact thickness of the unit has not been measured accurately in this section because of structural complications. The blue siltstone, from which this collecion is derived is about 800 ft thick. Faunal compositions suggests a Middle Miocene age, with affinities to the Progreso Fm, and Middle Miocene formations of Peru. Taxa are share with the Gatun fm, the Tubera Fm, the Cucurrupi Fm of Colombia. | |||||
Lithology and environment
| Primary lithology: | blue poorly lithified siltstone |
| Includes fossils? | Y |
| Lithology description: Recessive blue siltstone | |
| Environment: | offshore |
| Geology comments: Deposition at slightly greater depth, quiet conditions, several kilometers from shore, siliciclastic environment, with normal salinity conditions, during relative highstand. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | all microfossils |
| Collection methods: | selective quarrying,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
| Database number: | 61082 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2006-05-29 16:00:22 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2006-05-29 16:00:22 |
| 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] |