Río Roble: Early/Lower Barremian, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Malacostraca
- Decapoda
|
||||||||||
|
Decapoda indet.
Latreille 1802
|
Kellner et al. 2003 | decapod |
||||||||
|
Cephalopoda
- Ammonoidea
- Oppeliidae
|
||||||||||
|
Sanmartinoceras africanum
|
Kellner et al. 2003 | ammonite |
||||||||
| Subspecies: insignicostatum | ||||||||||
|
Cephalopoda
- Ammonoidea
- Neocomitidae
|
||||||||||
|
Hatchericeras patagonense
Stanton 1901
|
Kellner et al. 2003 | ammonite |
||||||||
|
unclassified
|
||||||||||
|
Cryptocrioceras yrigoyeni
|
Kellner et al. 2003 | |||||||||
|
Reptilia
- Pterosauria
- Anhangueridae
|
||||||||||
|
? Anhangueridae indet.
Campos and Kellner 1985
|
Kellner et al. 2003 | 2 specimens | pterosaur |
|||||||
| MACN-SC 3617, ulna and isolated ?wing metacarpal | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Argentina | State/province: | Santa Cruz |
| Coordinates: | 48.0° South, 72.0° West (view map) | ||
| Paleocoordinates: | 48.0° South, 35.5° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Early/Lower Cretaceous |
| Stage: | Barremian | 10 m.y. bin: | Cretaceous 2 |
| Key time interval: | Early/Lower Barremian | Ammonoid zone: | Hatchericeras patagonense |
| Age range of interval: | 130.0 - 125.0 m.y. ago |
Stratigraphy
| Formation: | Río Belgrano | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Early-Middle Barremian based upon ammonoids | |||||
Lithology and environment
| Primary lithology: | concretionary sandstone | ||
| Includes fossils? | Y | ||
| Lithology description: "Green sandstones with parallel bedding, organised in coarsening up sequences, with green brownish shales at the base. Epidiagenetic red sandy concretions are common a few meters above the contact with the underlying Río Mayer Formation. Ammonoids, crustacean decapods and the pterosaur bones were found at this level" | |||
| Environment: | coastal indet. | Tectonic setting: | back-arc basin |
| Geology comments: "A series of transgressive and regressive cycles from the Pacific sea characterises a retroarc basin where important accumulations of continental and marine deposits are recorded during the Cretaceous" "The green sandstones of the Río Belgrano Formation show the beginning of the marine regression in the area. Facies indicate the transition to a littoral near coast high energy environmental. The pterosaur remains were found in a near-shore environment, which to the top shows an even higher energy facies that finally changes to fluviatile continental facies." | |||
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | medium |
| Disassociated major elements: | some |
| Disassociated minor elements: | some |
| Fragmentation: | frequent |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | MACN |
Metadata
| Database number: | 92232 | ||
| Authorizer: | R. Butler | Enterer: | R. Butler |
| Modifier: | R. Butler | Research group: | vertebrate |
| Created: | 2009-11-04 01:46:11 | Last modified: | 2009-11-04 03:52:56 |
| Access level: | the public | Released: | 2009-11-04 01:46:11 |
Reference information
Primary reference:
| |||
Secondary references:
|