Onzole Formation
Onzole Formation Stratigraphic range: Early Pliocene (Montehermosan-Chapadmalalan) ~ | |
---|---|
Type | Geological formation |
Unit of | |
Sub-units | Súa & Esmeraldas Members |
Overlies | Angostura Formation |
Lithology | |
Primary | Shale |
Other | Mudstone |
Location | |
Coordinates | 1°00′N 79°36′W / 1.0°N 79.6°WCoordinates: 1°00′N 79°36′W / 1.0°N 79.6°W |
Approximate paleocoordinates | 0°48′N 78°48′W / 0.8°N 78.8°W |
Region | Esmeraldas Province |
Country | Ecuador |
Extent | |
Type section | |
Named for | Onzole River |
Onzole Formation (Ecuador) |
The Onzole Formation is an Early Pliocene (Montehermosan to Chapadmalalan in the SALMA classification) geologic formation in the of northwestern Ecuador. The formation consists of a shallow marine sandstone member containing many fish fossils, among which megalodon, and a deep water member comprising tuffaceous shales and mudstones containing gastropods, bivalves and scaphopods.[1][2]
Subdivision[]
The formation consists of the Esmeraldas Member, which is a unit comprising highly foraminiferal tuffaceous calcareous shale. They were deposited by shallow water , which brought the Esmeraldas fauna into the deep water (1,000 metres (3,300 ft)) from shallow water, on the order of 75 metres (246 ft).[3]
The Esmeraldas Member is covered by the Súa Member comprising burrowed, bioturbated, silty sandstones deposited in a coastal environment.
Fossil content[]
The formation has provided bivalve, gastropod, and scaphopod fossils and the following vertebrates:[4][5][6]
- ,
- Carcharocles megalodon
- [7]
- Galeocerdo aduncus
- Hemipristis serra
- Negaprion eurybathrodon
- Chilara taylori
- , [8]
- Merluccius cf. angustimanus
- Paraconger californiensis
- , , Porichthys cf. notatus
- [9]
- Anchoa sp.
- Apogon sp.
- Citharichthys sp.
- Diaphus sp.
- Haemulon sp.
- Lampadena sp.
- Apogonidae indet.
- Cynoglossidae indet.
- Gobiidae indet.
- Gerreidae indet.
- Opistognathidae indet.
- Pleuronectidae indet.
- ?Serranidae indet.
See also[]
References[]
- ^ Onzole Formation at Fossilworks.org
- ^ Onozole (sic) Formation at Fossilworks.org
- ^ Esmeraldas Beds at Fossilworks.org
- ^ Súa Member, Onzole Formation at Fossilworks.org
- ^ Punta La Gorda at Fossilworks.org
- ^ Punta la Colorada at Fossilworks.org
- ^ Schwarzhans & Aguilera, 2013
- ^ Schwarzhans & Aguilera, 2016
- ^ Aguilera et al., 2016
Bibliography[]
- Otoliths of the Sciaenidae from the Neogene of tropical America. 14. 7–90. Accessed 2019-02-09. ; , and . 2016.
- Otoliths of the Ophidiiformes from the Neogene of tropical America. 14. 91–124. Accessed 2019-02-09. , and . 2016.
- Otoliths of the Myctophidae from the Neogene of tropical America. 13. 83–150. Accessed 2019-02-09. , and . 2013.
Further reading[]
- G. Carnevale, W. Landini, L. Radgaini, C. Celma, G. and Cantalamessa. 2011. Taphonomic and paleoecological analyses (mollusks and fishes) of the Súa Member condensed shelled, upper Onzole Formation (Early Pliocene, Ecuador). Palaios 26(3):160-172
- A. E. Longbottom. 1979. Miocene Sharks' teeth from Ecuador. Bulletin of The British Museum (Natural History) Geology 32:57-70
- W. D. Pitt and L.J. Pitt. 1997. Nassarius (Mollusca: Neogastropoda) from the Neogene of northwestern Ecuador. Tulane Studies in Geology and Paleontology 29:135-150
- E. H. Vokes and H. E. Vokes. 2000. Catalogue of Tulane University fossil localities
- E. H. Vokes. 1988. Muricidae (Mollusca: Gastropoda) of the Esmeraldas Beds, northwestern Ecuador. Tulane Studies in Geology and Paleontology 21(1):1-50
- Geologic formations of Ecuador
- Pliocene Series of South America
- Neogene Ecuador
- Chapadmalalan
- Montehermosan
- Shale formations
- Mudstone formations
- Sandstone formations
- Deep marine deposits
- Shallow marine deposits
- Paleontology in Ecuador
- Geography of Esmeraldas Province