Locality 31, Bahia Tortuga - Beal (1948): Early/Lower Miocene, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Pectinida
- Pectinidae
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Pecten (Leptopecten) andersoni
Arnold 1906
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| recombined as Pacipecten andersoni | |||||||
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Chondrichthyes
- Lamniformes
- Lamnidae
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Isurus hastalis
(Agassiz 1838)
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| recombined as Carcharodon hastalis | |||||||
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Chondrichthyes
- Carcharhiniformes
- Hemigaleidae
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Hemipristis heteropleurus
Agassiz 1844
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| see common names | |||||||
Geography
| Country: | Mexico | State/province: | Baja California Sur | County: | Scamon Lagoon |
| Coordinates: | 27.7° North, 114.9° West (view map) | ||||
| Paleocoordinates: | 26.8° North, 108.5° 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: | Early/Lower Miocene | ||
| Age range of interval: | 23.03000 - 15.98000 m.y. ago |
Stratigraphy
| Formation: | Ysidro | ||||
| Local section: | Bahia Tortuga | ||||
| Regional section: | Baja California Su | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: The Ysidro Formation consists of dirty-white sandstone, underlying the Comondu Formation. The formation varies in lithology from place to place and apparently becomes more tuffaceous towards the gulf coast. The formation can be subdivided into two members, a lower shale member and an upper sandstone member. Collected from just above contact with Tepetate | |||||
Lithology and environment
| Primary lithology: | white sandstone |
| Includes fossils? | Y |
| Lithology description: Dirty white sandstone. | |
| Environment: | marine indet. |
| Geology comments: No paleoenvironmental data presented. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | selective quarrying,field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: Collected, studied and determined by Hertlein and Jordan (1927). No known repository. | |
| Taxonomic list comments:Representative. | |
Metadata
| Also known as: | Loc. 31 | ||
| Database number: | 43806 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-08-26 10:06:18 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2004-08-26 10:06:18 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 11515. | C. H. Beal. 1948. Reconnaissance of the geology and oil possibilities of Baja California, Mexico. Geological Society of America Memoir 31 [A. Miller/A. Hendy/A. Hendy] |