Locality 26, Arroyo Purisima - Beal (1948): Early/Lower Miocene, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Turritellidae
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Turritella tristis
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Turritella cf. margaritana
Nomland 1917
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Turritella cf. ocoyana
Conrad 1855
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Gastropoda
- Neotaenioglossa
- Calyptraeidae
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Trochita costellata
Conrad 1857
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| recombined as Calyptraea costellata | ||||||||||
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Gastropoda
- Neogastropoda
- Muricidae
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Rapana vaquerosensis
(Arnold 1908)
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| recombined as Califrapana vaquerosensis | ||||||||||
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Gastropoda
- Strombidae
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Strombus sp. n. sp.
Linnaeus 1758
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| Listed as "Strombus sp. nov." | ||||||||||
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Bivalvia
- Pectinida
- Pectinidae
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Pecten cf. crassicardo
(Conrad 1856)
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| recombined as Lyropecten crassicardo | ||||||||||
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Pecten aff. lecontei
Arnold 1906
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| Listed as "Pecten sp. nov. aff. P. lecontei" | ||||||||||
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Bivalvia
- Ostreida
- Ostreidae
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Ostrea bougeoisii
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Bivalvia
- Arcida
- Arcidae
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Arca cf. osmonti
Dall 1909
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| recombined as Anadara osmonti | ||||||||||
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Bivalvia
- Cardiida
- Veneridae
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Chione sp.
von Mühlfield 1811
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Bivalvia
- Carditida
- Carditidae
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Venericardia cf. californica
Dall 1903
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| recombined as Coanicardita californica | ||||||||||
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Thecostraca
- Balanomorpha
- Balanidae
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Balanus concavus
Bronn 1831
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| recombined as Concavus concavus | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Mexico | State/province: | Baja California Sur | County: | Purisima |
| Coordinates: | 26.2° North, 112.3° West (view map) | ||||
| Paleocoordinates: | 25.3° North, 105.9° 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: | Arroyo Guajademi | ||||
| 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. According to J. Smith this has lower Miocene affinities. | |||||
Lithology and environment
| Primary lithology: | white sandstone |
| Includes fossils? | Y |
| Lithology description: Dirty white sandstone. | |
| Environment: | coastal indet. |
| Geology comments: Shallow marine assemblage. No specific 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: Collection studied and determined by J. Smith. No known repository. | |
| Taxonomic list comments:Representative. | |
Metadata
| Also known as: | Loc. 26 | ||
| Database number: | 43811 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-08-26 10:19:08 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2004-08-26 10:19:08 |
| 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] |