Arroyo Seco, Cerro Guillermo (upper): Late/Upper Coniacian - Early/Lower Santonian, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
- Testudines
- Chelidae
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Chelidae indet.
Gray 1825
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Reptilia
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Titanosauria indet.
Bonaparte and Coria 1993
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| see common names | |||||||
Geography
| Country: | Argentina | State/province: | Mendoza | County: | Malargüe |
| Coordinates: | 37.1° South, 69.4° West (view map) | ||||
| Paleocoordinates: | 42.4° South, 49.8° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Altitude: | 900 meters | ||||
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| 10 m.y. bin: | Cretaceous 6 | ||
| Key time interval: | Late/Upper Coniacian - Early/Lower Santonian | ||
| Age range of interval: | 89.80000 - 83.60000 m.y. ago |
Stratigraphy
| Geological group: | Neuquén | Formation: | Plottier | ||
| Local section: | Arroyo Seco | Local bed: | 18 m | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: formation is now a subgroup containing 2 formations: "upper section of the Río Neuquén Formation" corresponds to the Plottier Formation within the Río Neuquén Subgroup. | |||||
Lithology and environment
| Primary lithology: | wave ripples,"cross stratification",volcaniclastic,green sandstone |
| Secondary lithology: | gray,red mudstone |
| Includes fossils? | Y |
| Lithology description: "The fossil-rich level is composed of greenish (10YR 7/2), mica-rich, feldspathic wackes interbedded with mottled red (2.5 YR 4/4) and gray shales." | |
| Environment: | crevasse splay |
| Geology comments: "overbank deposits associated with sandy fluvial channels developed on a huge muddy flood plain"; specifically a "proximal overbank" facies | |
Taphonomy
| Modes of preservation: | body |
| Degree of concentration: | concentrated |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | good |
| Articulated whole bodies: | none |
| Associated major elements: | some |
| Disassociated major elements: | some |
| Disassociated minor elements: | some |
| Fragmentation: | occasional |
| Encrustation: | none |
| Spatial resolution: | parautochthonous |
Collection methods and comments
| Collection methods: | selective quarrying,mechanical,field collection |
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 73488 | ||
| Authorizer: | M. Carrano | Enterer: | M. Carrano |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2007-06-18 14:18:21 | Last modified: | 2017-05-23 16:34:15 |
| Access level: | the public | Released: | 2007-06-18 14:18:21 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 24659. | ETE | B. J. González Riga and R. A. Astini. 2007. Preservation of large titanosaur sauropods in overbank fluvial facies: a case study in the Cretaceous of Argentina. Journal of South American Earth Sciences 23:290-303 [M. Carrano/M. Carrano] |