Arroyo Las Capillas - Colección Loss: Rhuddanian, Argentina
collected by Renato Loss
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Pterobranchia
- Graptoloidea
- Normalograptidae
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| see common names | |||||||
Geography
| Country: | Argentina | State/province: | Jujuy |
| Coordinates: | 24.0° South, 65.0° West (view map) | ||
| Paleocoordinates: | 65.6° South, 168.6° East (Wright 2013) | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | outcrop |
Time
| Period: | Silurian | Epoch: | Llandovery |
| Stage: | Rhuddanian | 10 m.y. bin: | Silurian 1 |
| Key time interval: | Rhuddanian | Graptolite zone: | Parakidograptus acuminatus - Atavograptus atavus |
| Age range of interval: | 443.1 - 440.5 m.y. ago |
Stratigraphy
| Formation: | Lipeón | ||||
| Stratigraphic resolution: | member | ||||
| Stratigraphy comments: Lower part of formation. | |||||
Lithology and environment
| Primary lithology: | siltstone |
| Lithology description: Cecioni (1949) and Baldis et al. (1976) recognised three members in the Lipeón Formation. The lower member ("areniscas amarillentas", ca. 220 m thick) consists of fine to medium micaceous wackes of yellow brown colour with iron staining. In the basal 17m of this member there are two iron beds ofhaematitic wackes, the lowest one of economic value (Boso and Monaldi, 1990). The middle member ("areniscas y arcillas claras", ca. 300 m thick) is characterised by brawn to grey siltstones and mudstones, including subordinate, dark wackes in the lower part. Near the top of the member, the sandy levels are more frequent, grading to the Arroyo Colorado Formation (early Devonian), which indicates the beginning of a regressive cycle (from Rickards et al. 2002). | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | mold/impression |
| Size of fossils: | microfossils |
Collection methods and comments
| Collection excludes: | all microfossils |
| Collection methods: | survey of museum collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collectors: | Renato Loss |
| Collection method comments: "El material de la “Colección Loss” se encuentra alojado en el Museo de Ciencias Naturales “Dr. Saturnino Iglesias” del Instituto de Geología y Minería de la Universidad Nacional de Jujuy, bajo el prefijo JUY-P" | |
Metadata
| Database number: | 238717 | ||
| Authorizer: | E. Vlachos | Enterer: | N. Herrera Sánchez |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2025-02-07 13:44:17 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2025-02-07 13:44:17 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 88852. | B. Toro, N. C. Herrera Sánchez, and G. A. Lo Valvo. 2024. Graptolitos del noroeste argentino de la “Colección Loss”: taxonomía, edad y correlación. Publicación Electrónica de la Asociación Paleontológica Argentina 24(2):1-22 [E. Vlachos/N. Herrera Sánchez] |