Gulf of California section 2 "unconformity (upper)" fauna: Late/Upper Pleistocene, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Thecostraca
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Cirripedia indet.
Rafinesque 1816
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Listed as "barnacle plates" | ||||||||||
Bivalvia
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Bivalvia indet.
Linnaeus 1758
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Listed as "unidentifiable bivalves" | ||||||||||
Bivalvia
- Ostreida
- Ostreidae
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Ostrea sp.
Linnaeus 1758
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Bivalvia
- Pectinida
- Pectinidae
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Pectinidae indet.
Wilkes 1810
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Listed as "scallop fragments" | ||||||||||
Bivalvia
- Cardiida
- Cardiidae
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Trachycardium sp.
Mörch 1853
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Bivalvia
- Cardiida
- Veneridae
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Chione gnidia
(Broderip and Sowerby I 1829)
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recombined as Chionopsis gnidia | ||||||||||
Chione californiensis
(Broderip and Sowerby I 1835)
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Gastropoda
- Neogastropoda
- Columbellidae
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Columbella sp.
Lamarck 1799
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Gastropoda
- Tegulidae
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Tegula rugosa
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see common names |
Geography
Country: | Mexico | State/province: | Sonora |
Coordinates: | 31.8° North, 114.1° West (view map) | ||
Paleocoordinates: | 31.8° North, 114.1° West | ||
Basis of coordinate: | estimated from map | ||
Geographic resolution: | outcrop |
Time
Period: | Quaternary | Epoch: | Pleistocene |
10 m.y. bin: | Cenozoic 6 | ||
Key time interval: | Late/Upper Pleistocene | ||
Age range of interval: | 0.12600 - 0.01170 m.y. ago |
Stratigraphy
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: Pleistocene fluvial, eolian, and deltaic deposits exposed in sea cliffs, overlain by coquina bed (dated at 125,00 bp) |
Lithology and environment
Primary lithology: | "cross stratification",planar lamination,deformed bedding,burrows,bioturbation,fine,medium unlithified sandstone | ||
Secondary lithology: | siltstone | ||
Includes fossils? | Y | ||
Includes fossils? | Y | ||
Lithology description: massive fine- to medium-grained sands; bedding almost obscured by bioturbation; bedding mostly planar or low-angle corss-stratified, rare wavy beds and reactivation cross-beds; Ophiomorpha and Thalassinoides burrows common; burrows backfilled with shelly debris; Skolithos rare to common | |||
Environment: | transition zone/lower shoreface | Tectonic setting: | rift |
Geology comments: active trans-tensional rift basin |
Taphonomy
Modes of preservation: | body |
Degree of concentration: | concentrated |
Size of fossils: | macrofossils |
Spatial orientation: | random |
Articulated whole bodies: | none |
Disassociated major elements: | all |
Fragmentation: | extreme |
Bioerosion: | occasional |
Encrustation: | occasional |
Spatial resolution: | parautochthonous |
Collection methods and comments
Collection methods: | bulk,field collection |
Reason for describing collection: | taphonomic analysis |
Collection method comments: No comments on collection metholodolgy | |
Taxonomic list comments:No abundance data given on collection due to poor preservation |
Metadata
Also known as: | Section 2 - unconformity (upper) shell bed type | ||
Database number: | 34936 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy |
Modifier: | A. Hendy | Research group: | marine invertebrate |
Created: | 2003-10-20 14:01:10 | Last modified: | 2013-11-25 13:37:23 |
Access level: | group members | Released: | 2004-10-20 14:01:10 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
9379. | 1% 4820 | K.H. Meldahl and A. H. Cutler. 1992. Neotectonics and taphonomy; Pleistocene molluscan shell accumulations in the northern Gulf of California. Palaios 7(2):187-197 [A. Miller/A. Hendy/A. Hendy] |