Variegated Member, Zorritos Formation: Early/Lower Miocene, Peru
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda
- Cerithiidae
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Cerithium grillanum
Spieker 1922
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Gastropoda
- Tonnidae
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Dolium (Malea) sp.
(Valenciennes 1833)
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original and current combination Malea | ||||||||||
Gastropoda
- Neogastropoda
- Buccinidae
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Solenosteira alternata
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Nassa zorritensis
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Gastropoda
- Neogastropoda
- Conidae
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Conus molis
Brown and Pilsbry 1911
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Subspecies: Conus molis bravoi | ||||||||||
Gastropoda
- Naticidae
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Polinices subangulata
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Bivalvia
- Pectinida
- Anomiidae
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Anomia berryi
Spieker 1922
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synonym of Anomia peruviana | ||||||||||
Bivalvia
- Arcida
- Arcidae
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Arca (Noetia) cholana
Spieker 1922
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Arca (Scapharca) pantheonensis
Spieker 1922
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Arca (Cunearca) sp.
(Dall 1898)
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spelled with current rank as Anadara (Cunearca) | ||||||||||
Arca (Anadara) nelsoni
Spieker 1922
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synonym of Anadara (Grandiarca) chiriquiensis | ||||||||||
Arca (Anadara) septifera
Grzybowski 1899
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synonym of Anadara (Grandiarca) chiriquiensis | ||||||||||
Arca (Anadara) toroensis
Spieker 1922
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synonym of Anadara (Grandiarca) chiriquiensis | ||||||||||
Bivalvia
- Pholadida
- Corbulidae
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Corbula (Cuneocorbula) propinqua
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original and current combination Cuneocorbula | ||||||||||
Corbula (Cuneocorbula) fabiformis
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original and current combination Cuneocorbula | ||||||||||
Bivalvia
- Cardiida
- Veneridae
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Macrocallista helenae
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Dosinia (Dosinidia) grandis
Nelson 1870
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synonym of Dosinia ponderosa | ||||||||||
see common names |
Geography
Country: | Peru | State/province: | Tumbes |
Coordinates: | 3.7° South, 80.7° West (view map) | ||
Paleocoordinates: | 4.9° South, 76.4° West | ||
Basis of coordinate: | based on nearby landmark | ||
Geographic resolution: | local area |
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: | Zorritos | Member: | Variegated | ||
Local section: | Zorritos | ||||
Regional section: | Tumbes-Progreso | ||||
Stratigraphic resolution: | member | ||||
Stratigraphy comments: Stated as Early Miocene by Spieker (1922) and corroborated by more recent publications (e.g. see Higley 2004). Overlies the late Oligocene-early Miocene Heath Fm and underlies the Cardalitos Fm in Higley (2004) although Spieker (1922) uses varying lithostratigraphic nomenclature suggesting a "Talara Fm" overlies the upper member of the Zorritos Fm. Its is not clear whether definitions of these members has changed since Spieker. The variegated member of the Zorritos Fm is 310 ft thick and comprises claystone, oyster beds, and conglomeratic horizons. |
Lithology and environment
Primary lithology: | green,red poorly lithified claystone |
Secondary lithology: | unlithified argillaceous,sandy conglomerate |
Includes fossils? | Y |
Includes fossils? | Y |
Lithology description: Comprises the following: 1) green clay, locally red, gray, publish; 2) carbonaceous shale, gypsiferous; 3) oyster bed; 4) heavy beds of pebbles, with sandy and argillaceous matrix interbedded with clays and loose friable sandstones; 5) green clay, locally red, gray, purplish. | |
Environment: | coastal indet. |
Geology comments: Shallow water, sandy littoral, agitated. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Preservation of anatomical detail: | medium |
Collection methods and comments
Collection methods: | field collection,survey of museum collection |
Reason for describing collection: | taxonomic analysis |
Museum repositories: | YPM |
Collection method comments: Collected by J. Singewald, and with inspection of collections by E.T. Nelson (1870) at Yale University. Possibly also involved inspection of Grzybowski's material (Geol. Inst. of Cracow). Singewald's material is presumably reposited at Johns Hopkins. | |
Taxonomic list comments:Probably not exhaustive though certainly representative of diversity of Mollusca for these units. |
Metadata
Database number: | 59000 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy | Research group: | marine invertebrate |
Created: | 2006-03-05 21:25:43 | Last modified: | 2013-11-25 13:37:23 |
Access level: | the public | Released: | 2006-03-05 21:25:41 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
16748. | E. M. Spieker. 1922. The Paleontology of the Zorritos Formation of the North Peruvian Oil Fields. The Johns Hopkins University Studies in Geology 3:1-196 [A. Miller/A. Hendy] |