Gulf of California section 5 "beach berm" fauna: Late Pleistocene, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Turritellidae
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Turritella sp.
Lamarck 1799
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1 %-specimens | |||||||||
| Less than 2% abundance | ||||||||||
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Bivalvia
- Cardiida
- Cardiidae
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Trachycardium sp.
Mörch 1853
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1 %-specimens | |||||||||
| Less than 2% abundance | ||||||||||
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Bivalvia
- Cardiida
- Veneridae
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Chione gnidia
(Broderip and Sowerby I 1829)
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98 %-specimens | |||||||||
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Chione californiensis
(Broderip and Sowerby I 1835)
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1 %-specimens | |||||||||
| Less than 2% abundance | ||||||||||
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Thecostraca
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Cirripedia indet.
Rafinesque 1816
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| Listed as "barnacle plates"; no abundance given | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Mexico | State/province: | Sonora |
| Coordinates: | 31.8° North, 114.1° West (view map) | ||
| Paleocoordinates: | |||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | outcrop |
Time
| Period: | Quaternary | Epoch: | Pleistocene |
| Stage: | Late Pleistocene | 10 m.y. bin: | Cenozoic 6 |
| Key time interval: | Late Pleistocene | ||
| Age range of interval: | 0.129 - 0.0117 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,bioturbation,shelly/skeletal unlithified sandstone | ||
| Includes fossils? | Y | ||
| Lithology description: Planar bedded and low-angle corss-bedded shell hash sands are associated with shell bed. Bioturbation limited to rare | |||
| Environment: | foreshore | 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: | preferred |
| Articulated whole bodies: | none |
| Disassociated major elements: | all |
| Fragmentation: | frequent |
| Bioerosion: | frequent |
| Encrustation: | none |
| 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 | |
Metadata
| Also known as: | Section 5 - Beach berm shell bed type | ||
| Database number: | 34938 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2003-10-20 14:30:07 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | group members | Released: | 2004-10-20 14:30:07 |
| Creative Commons license: | CC0 | ||
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] |